记录python学习的每一刻:
eg1:有四个数字:1、2、3、4,能组成多少个互不相同且无重复数字的三位数?各是多少?
for i in range(1,5):
for j in range(1,5):
for k in range(1,5):
if(i!=j) and (i!=k) and (j!=k):
print(i,j,k)
eg2:企业发放的奖金根据利润提成。利润(I)低于或等于10万元时,奖金可提10%;利润高于10万元,低于20万元时,低于10万元的部分按10%提成,高于10万元的部分,可提成7.5%;20万到40万之间时,高于20万元的部分,可提成5%;40万到60万之间时高于40万元的部分,可提成3%;60万到100万之间时,高于60万元的部分,可提成1.5%,高于100万元时,超过100万元的部分按1%提成,从键盘输入当月利润I,求应发放奖金总数?
i = float(input('请输入您的利润额:'))
arr = [1000000,600000,400000,200000,100000,0]
rat = [0.01,0.015,0.03,0.05,0.075,0.1]
r = 0
for idx in range(1,6):
if i > arr[idx]:
r+=(i-arr[idx])*rat[idx]
i=arr[idx]
print('发放奖金总数为:',r)
eg3:一个整数,它加上100后是一个完全平方数,再加上168又是一个完全平方数,请问该数是多少?
import math
a = int(math.sqrt(168))+1
for i in range(1,a):
if 168 % i ==0:
j = 168 / i
if (i+j)%2 == 0 and (i-j)%2 == 0:
m = (i+j)/2
n = (i-j)/2
x = n*n-100
print(x)
eg4:输入某年某月某日,判断这一天是这一年的第几天?
year = int(input("请输入年份:"))
month = int(input("请输入月份:"))
day = int(input("请输入日:"))
sum = 0
arr = [0,31,59,90,120,151,181,212,243,273,304,334]
if 0 < month <= 12:
sum = arr[month-1]
else:
print("您输入的数据有误!!!!")
sum = sum + day
leap = 0
if (year % 400 == 0) or ((year % 4 ==0) and (year % 100 !=0)):
leap = 1
if (leap == 1) and (month >= 2):
sum = sum +1
print("It is the %dth day" % sum)
eg5:输入三个整数x,y,z,请把这三个数由小到大输出
value = []
for i in range(1,4):
x = int(input("请输入值:"))
value.append(x)
for k in range(0,2):
if value[k] > value[k+1]:
t = value[k+1]
value[k+1] = value[k]
value[k] = t
print(value)
eg6:斐波那契数列
def fib(n):
if n == 0:
return 0
if n==1 or n==2:
return 1
else:
return fib(n-1)+fib(n-2)
print(fib(10))
eg7:将一个列表的数据复制到另一个列表中
import re
a = input("请输入数组a:")
print(type(re.split('\s',a)))
b = list(map(int,re.split('\s',a)))
s = a[:]
print(s)
eg8:输出 9*9 乘法口诀表
for i in range(1,10):
print()
for j in range(1,i+1):
print("%d * %d = %d"%(i,j,i*j),end=" ")
eg9:暂停一秒输出
import re
import time
a = input("请输入字符串:")
s = list(map(int,re.split('\s',a)))
for i in range(len(s)):
print(s[i])
time.sleep(1)
eg10:暂停一秒输出,并格式化当前时间
import time
print(time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())))
time.sleep(1)
print(time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())))
print(type(time.time()))
print(type(time.localtime()))
print(type(time.localtime(time.time())))
eg11:古典问题:有一对兔子,从出生后第3个月起每个月都生一对兔子,小兔子长到第三个月后每个月又生一对兔子,假如兔子都不死,问每个月的兔子总数为多少?
def fib(n):
if n == 1 or n == 2:
return 2
else:
return fib(n-1)+fib(n-2)
t = int(input("请输入天数:"))
print("第%d天后共有兔子%d只"%(t,fib(t)))
eg12:判断101-200之间有多少个素数,并输出所有素数
import math
sum = 0
leap = 1
for i in range(101,201):
for j in range(2,int(math.sqrt(i+1))+1):
if i % j ==0 :
leap = 0
break
if leap == 1:
print(i)
sum += 1
leap =1
print("101~201之间共有%d个素数"%sum)
eg13:打印出所有的"水仙花数",所谓"水仙花数"是指一个三位数,其各位数字立方和等于该数本身。例如:153是一个"水仙花数",因为153=1的三次方+5的三次方+3的三次方
for i in range(100,1000):
n = i // 100
m = i % 100 // 10
k = i % 10
if n*n*n + m*m*m + k*k*k == i:
print(i)
eg14:将一个正整数分解质因数。例如:输入90,打印出90=233*5
def reduceNum(n):
print("{} =".format(n),end=" ")
if not isinstance(n,int) or n<=0:
print("请输入一个正确的数字!")
exit(0)
elif n == 1:
print("{}".format(1),end=" ")
while n not in [1]:
for i in range(2,n+1):
if n%i == 0:
n //= i
if n == 1:
print(i)
else:
print("{} *".format(i),end=" ")
reduceNum(int(input("input a num:")))
eg15:利用条件运算符的嵌套来完成此题:学习成绩>=90分的同学用A表示,60-89分之间的用B表示,60分以下的用C表示
score = int(input('输入分数:\n'))
if score >= 90:
grade = 'A'
elif score >= 60:
grade = 'B'
else:
grade = 'C'
print('%d 属于 %s' % (score, grade))
eg16:输出指定格式的日期
import datetime
if __name__ == '__main__':
print(datetime.date.today().strftime('%d/%m/%Y'))
miyazakiBirthDate = datetime.date(1941, 1, 5)
print(miyazakiBirthDate.strftime('%d/%m/%Y'))
miyazakiBirthNextDay = miyazakiBirthDate + datetime.timedelta(days=1)
print(miyazakiBirthNextDay.strftime('%d/%m/%Y'))
miyazakiFirstBirthday = miyazakiBirthDate.replace(year=miyazakiBirthDate.year + 1)
print(miyazakiFirstBirthday.strftime('%d/%m/%Y'))
eg17:输入一行字符,分别统计出其中英文字母、空格、数字和其它字符的个数
import string
s = input('请输入一个字符串:\n')
letters = 0
space = 0
digit = 0
others = 0
for c in s:
if c.isalpha():
letters += 1
elif c.isspace():
space += 1
elif c.isdigit():
digit += 1
else:
others += 1
print ('char = %d,space = %d,digit = %d,others = %d' % (letters,space,digit,others))
eg18:求s=a+aa+aaa+aaaa+aa…a的值,其中a是一个数字。例如2+22+222+2222+22222(此时共有5个数相加),几个数相加由键盘控制
def sum(n):
total = 1
if n == 1 :
total = 10 * (n-1)+1
else:
total = total*n+sum(n-1)*10
return total
a = int(input("a:"))
b = int(input("b:"))
print(a*sum(b))
eg19:一个数如果恰好等于它的因子之和,这个数就称为"完数"。例如6=1+2+3.编程找出1000以内的所有完数
def wanshu():
for i in range(1,1000):
s = i
sum = i
for j in range(1,i):
if i%j == 0:
sum -= j
else:
continue
if sum == 0:
print(s)
wanshu()
eg20:一球从100米高度自由落下,每次落地后反跳回原高度的一半;再落下,求它在第10次落地时,共经过多少米?第10次反弹多高?
def luoti(high,n):
s = 0
total = 0
t = high
if n == 1:
s = high/2
total = high + s
else:
for i in range(1,n+1):
s = high/2
high = s
total = total + s*2
total = total-2*s+t
print("第%d次落地时,共经过%f米,第%d反弹%f米"%(n,total,n,s))
luoti(100,10)
eg21:猴子吃桃问题:猴子第一天摘下若干个桃子,当即吃了一半,还不瘾,又多吃了一个第二天早上又将剩下的桃子吃掉一半,又多吃了一个。以后每天早上都吃了前一天剩下的一半零一个。到第10天早上想再吃时,见只剩下一个桃子了。求第一天共摘了多少
n = 1
for day in range(9,0,-1):
m = (n+1)*2
n = m
print(m)
eg22:两个乒乓球队进行比赛,各出三人。甲队为a,b,c三人,乙队为x,y,z三人。已抽签决定比赛名单。有人向队员打听比赛的名单。a说他不和x比,c说他不和x,z比,请编程序找出三队赛手的名单
def paixu():
fist = ['c','a','b']
second = ['x','y','z']
for i in range(2):
if fist[i] == 'a' and second[i] == 'x':
second[i] = second[i+1]
second[i+1] = 'x'
elif fist[i] == 'c' and second[i] == 'z':
second[i] = second[i+1]
second[i + 1] = 'z'
elif fist[i] == 'c' and second[i] == 'x':
second[i] = second[i + 1]
second[i + 1] = 'x'
else:
continue
print("三队赛手的名单:")
for i in range(3):
print("%s-->%s"%(fist[i],second[i]))
paixu()
eg23:打印出菱形图案
from sys import stdout
for i in range(4):
for j in range(4-i-1):
stdout.write(" ")
for k in range(2*i+1):
stdout.write("*")
print(" ")
for m in range(3):
for t in range(m+1):
stdout.write(" ")
for n in range(5-2*m):
stdout.write("*")
print(" ")
eg24:有一分数序列:2/1,3/2,5/3,8/5,13/8,21/13…求出这个数列的前20项之和
a = 1
b = 2
s = 0
for n in range(1,20):
s += b/a
a,b = b,a+b
print(s)
eg25:求1+2!+3!+…+20!的和
from functools import reduce
sum = 0
dp = range(1,21)
def rank(x):
s = 1
for i in range(1,x+1):
s = s*i
return s
print("1!+2!+3!+...+20!=",reduce(lambda x,y:x+y,map(rank,dp)))
eg26:利用递归方法求5!
def fn(i):
if i == 1:
return 1
else:
return i*fn(i-1)
print(fn(5))
eg27:利用递归函数调用方式,将所输入的5个字符,以相反顺序打印出来
def output(s,len):
if len == 0:
return
else:
print(s[len-1])
output(s,len-1)
s = input("please input a string:")
len = len(s)
output(s,len)
eg28:有5个人坐在一起,问第五个人多少岁?他说比第4个人大2岁。问第4个人岁数,他说比第3个人大2岁。问第三个人,又说比第2人大两岁。问第2个人,说比第一个人大两岁。最后问第一个人,他说是10岁。请问第五个人多大?
def age(n):
if n == 1:
return 10
else:
return age(n-1)+2
print(age(5))
eg29:给一个不多于5位的正整数,要求:一、求它是几位数,二、逆序打印出各位数字
x = int(input("please input a num:"))
a = x // 10000
b = x % 10000 // 1000
c = x % 1000 // 100
d = x % 100 // 10
e = x % 10
if a != 0:
print("%d 是5位数,逆序为:%d%d%d%d%d"%(x,e,d,c,b,a))
elif b != 0:
print("%d 是4位数,逆序为:%d%d%d%d"%(x,e,d,c,b))
elif c != 0:
print("%d 是3位数,逆序为:%d%d%d"%(x,e,d,c))
elif d != 0:
print("%d 是2位数,逆序为:%d%d"%(x,e,d))
elif e != 0:
print("%d 是1位数,逆序为:%d"%(x,e))
eg30:一个5位数,判断它是不是回文数。即12321是回文数,个位与万位相同,十位与千位相同
x = int(input("please input a num:"))
s = str(x)
len = len(s)
flag = True
for i in range(len):
if s[i] != s[len-i-1]:
flag = False
break
if flag:
print("%d 是一个回文数!"%x)
else:
print("%d 不是一个回文数!"%x)
eg31:请输入星期几的第一个字母来判断一下是星期几,如果第一个字母一样,则继续判断第二个字母
x = input("please input a letters:")
if x == 'M':
print("Monday")
elif x == 'F':
print("Friday")
elif x == 'W':
print("Wednesday")
elif x == 'T':
x = input("please input Second letter:")
if x == 'h':
print("Thursday")
else:
print("Tuesday")
else:
x = input("please input Second letter:")
if x == 'a':
print("Saturday")
else:
print("Sunday")
eg32:按相反的顺序输出列表的值
a = ['one','two','three']
for i in a[::-1]:
print(i)
eg33:按逗号分隔列表
import re
L = [1,2,3,4,5]
print(','.join(str(n) for n in L))
eg34:使用函数,输出三次 RUNOOB 字符串
def hello_runoob():
print('RUNOOB')
def hello_runoobs():
for i in range(3):
hello_runoob()
if __name__ == '__main__':
hello_runoobs()
eg35:文本颜色设置
class bcolor:
HEADER = '\033[95m'
OKBLUE = '\033[94m'
OKGREEN = '\033[92m'
WARNING = '\033[93m'
FAIL = '\033[91m'
ENDC = '\033[0m'
BOLD = '\033[1m'
UNDERLINE = '\033[4m'
print(bcolor.WARNING+'警告的颜色字体?'+bcolor.ENDC)
eg36:求100之内的素数
from math import sqrt
lower = int(input("please input minValue:"))
upper = int(input("please input maxValue:"))
for num in range(lower,upper+1):
if num > 1:
for i in range(2,int(sqrt(num)+1)):
if (num % i) == 0:
break
else:
print(num)
eg37:对10个数进行排序
import re
if __name__ == "__main__":
x = input("please input ten num: ")
s = list(map(int,re.split('\s',x)))
print("输入的数字列表:",s)
for i in range(len(s) - 1):
for j in range(i+1,len(s)):
if s[i] > s[j]:
t = s[i]
s[i] = s[j]
s[j] = t
print("排序后的数字列表:",s)
eg38:求一个3*3矩阵主对角线元素之和
import re
if __name__ == "__main__":
a = []
sum = 0
for i in range(3):
print("please input th",i+1, "th row three nums:")
x = input()
a.append(list(map(int,re.split('\s',x))))
print("3*3 数列如下:")
for i in range(3):
print(a[i])
sum += int(a[i][i])
print("对角线之和为:",sum)
eg39:有一个已经排好序的数组。现输入一个数,要求按原来的规律将它插入数组中
import re
def insertNum():
a = input("Please input String:")
key = int(input("Please input insert num:"))
b = re.split('\s', a)
listNum = list(map(int, b))
for i in range(len(b)):
if isinstance(i,int):
continue
else:
del(b[i])
print('由于您输入了非数字字符',i,',目前已剔除!')
for i in range(len(listNum)-1):
if listNum[i]>listNum[i+1]:
if listNum[i]>key and listNum[i+1]<key:
listNum.insert(i+1,key)
elif len(listNum)-2 == i and listNum[i+1]<key:
listNum.insert(0, key)
elif len(listNum)-2 == i and listNum[i+1]>key:
listNum.append(key)
else:
continue
elif listNum[i]<listNum[i+1]:
if listNum[i]<key and listNum[i+1]>key:
listNum.insert(i+1,key)
elif len(listNum)-2 == i and listNum[i+1]>key:
listNum.insert(0,key)
elif len(listNum)-2 == i and listNum[i+1]<key:
listNum.append(key)
else:
continue
else:
continue
print("插入后的列表为:",listNum)
insertNum()
eg40:将一个数组逆序输出
import re
def inverted():
str = input("请输入一组数字:")
strNum = list(map(int,re.split('\s',str)))
invertStr = strNum[::-1]
for i in range(len(invertStr)):
print(invertStr[i])
inverted()
eg41:模仿静态变量的用法
def varfunc():
var = 0
print ('var = %d' % var)
var += 1
if __name__ == '__main__':
for i in range(3):
varfunc()
class Static:
StaticVar = 5
def varfunc(self):
self.StaticVar += 1
print (self.StaticVar)
print (Static.StaticVar)
a = Static()
for i in range(3):
a.varfunc()
eg42:学习使用auto定义变量的用法
num = 2
def autofunc():
num = 1
print ('internal block num = %d' % num)
num += 1
for i in range(3):
print ('The num = %d' % num)
num += 1
autofunc()
eg43:模仿静态变量(static)另一案例
class Num:
nNum = 1
def inc(self):
self.nNum += 1
print ('nNum = %d' % self.nNum)
if __name__ == '__main__':
nNum = 2
inst = Num()
for i in range(3):
nNum += 1
print ('The num = %d' % nNum)
inst.inc()
eg44:两个 3 行 3 列的矩阵,实现其对应位置的数据相加,并返回一个新矩阵
import re
def arrayAdd():
str1 = input("please input the first array num: ")
str2 = input("please input the second array num: ")
strNum1 = list(map(int,re.split('\s',str1)))
strNum2 = list(map(int, re.split('\s', str2)))
midArray = []
Array1 = []
Array2 = []
Array = [[0,0,0],[0,0,0],[0,0,0]]
for i in range(len(strNum1)):
midArray.append(strNum1[i])
if (i+1)%3 == 0:
Array1.append(midArray)
midArray = []
else:
continue
for i in range(len(strNum2)):
midArray.append(strNum2[i])
if (i+1)%3 == 0:
Array2.append(midArray)
midArray = []
else:
continue
print(len(Array1))
for i in range(len(Array1)):
for j in range(len(Array1)):
Array[i][j] = Array1[i][j] + Array2[i][j]
print("The first Array is :",Array1)
print("The second Array is :", Array2)
print("The merge Array is :",Array)
arrayAdd()
eg45:统计 1 到 100 之和
def sum():
total = 0
for i in range(1,101):
total +=i
print(total)
sum()
eg46:求输入数字的平方,如果平方运算后小于 50 则退出
import time
def pinfang():
while True:
a = int(input("please input a num:"))
if a*a<50:
print(a,"的平方小于50,即将在3s退出!")
time.sleep(3)
break
else:
print(a,"的平方大于50!")
pinfang()
eg47:两个变量值互换
def exchange(a,b):
a,b = b,a
return (a,b)
if __name__ == '__main__':
x = 10
y = 20
print ('x = %d,y = %d' % (x,y))
x,y = exchange(x,y)
print ('x = %d,y = %d' % (x,y))
eg48:数字比较
if __name__ == '__main__':
i = 10
j = 20
if i > j:
print ('%d 大于 %d' % (i,j))
elif i == j:
print ('%d 等于 %d' % (i,j))
elif i < j:
print ('%d 小于 %d' % (i,j))
else:
print ('未知')
eg49:使用lambda来创建匿名函数
MAXIMUM = lambda x, y: (x > y) * x + (x < y) * y
MINIMUM = lambda x, y: (x > y) * y + (x < y) * x
if __name__ == '__main__':
a = 10
b = 20
print('The largar one is %d' % MAXIMUM(a, b))
print('The lower one is %d' % MINIMUM(a, b))
eg50:使用 random 模块输出一个随机数
import random
import string
print(random.randint(1,50))
print(random.randrange(0,101,2))
print(random.random())
print(random.uniform(1,10))
print(random.choice('abcdefghijklmnopqrstuvwxyz!@#$%^&*()'))
print(random.sample('abcdefghijklmnopqrstuvwxyz',5))
print(random.choice(['哈哈','嘻嘻','咕咕']))
a = [1,2,3,4,5,6,7,8,9,0]
random.shuffle(a)
print(a)
ran_str = ''.join(random.sample(string.ascii_letters + string.digits, 8))
print(ran_str)
print(''.join(random.sample(['z','y','x','w','v','u','t','s','r','q','p','o','n','m','l','k','j','i','h','g','f','e','d','c','b','a'], 5)))
eg51:学习使用按位与 &
if __name__ == '__main__':
a = 0x77
b = a & 3
print ('a & b = %d' % b)
b &= 7
print ('a & b = %d' % b)
eg52:学习使用按位或 |
if __name__ == '__main__':
a = 0o77
b = a | 3
print ('a | b is %d' % b)
b |= 7
print ('a | b is %d' % b)
eg53:学习使用按位异或 ^
if __name__ == '__main__':
a = 0o77
b = a ^ 3
print('The a ^ 3 = %d' % b)
b ^= 7
print('The a ^ b = %d' % b)
eg54:取一个整数a从右端开始的4〜7位
if __name__ == '__main__':
a = int(input('input a number:\n'))
b = a >> 4
c = ~(~0 << 4)
d = b & c
print ('%o\t%o' %(a,d))
eg55:使用按位取反~
a = 7
b = ~a
c = -7
d = ~c
print ('变量 a 取反结果为: %d' % b)
print ('变量 c 取反结果为: %d' % d)
eg56:画图,学用circle画圆形
if __name__ == '__main__':
from tkinter import *
canvas = Canvas(width=800, height=600, bg='pink')
canvas.pack(expand=YES, fill=BOTH)
k = 1
j = 1
for i in range(0, 26):
canvas.create_oval(310 - k, 250 - k, 310 + k, 250 + k, width=1)
k += j
j += 0.3
mainloop()
eg57:画图,学用line画直线
if __name__ == '__main__':
from Tkinter import *
canvas = Canvas(width=300, height=300, bg='green')
canvas.pack(expand=YES, fill=BOTH)
x0 = 263
y0 = 263
y1 = 275
x1 = 275
for i in range(19):
canvas.create_line(x0,y0,x0,y1, width=1, fill='red')
x0 = x0 - 5
y0 = y0 - 5
x1 = x1 + 5
y1 = y1 + 5
x0 = 263
y1 = 275
y0 = 263
for i in range(21):
canvas.create_line(x0,y0,x0,y1,fill = 'red')
x0 += 5
y0 += 5
y1 += 5
mainloop()
eg58:画图,学用rectangle画方形
if __name__ == '__main__':
from Tkinter import *
root = Tk()
root.title('Canvas')
canvas = Canvas(root,width = 400,height = 400,bg = 'yellow')
x0 = 263
y0 = 263
y1 = 275
x1 = 275
for i in range(19):
canvas.create_rectangle(x0,y0,x1,y1)
x0 -= 5
y0 -= 5
x1 += 5
y1 += 5
canvas.pack()
root.mainloop()
eg59:画图,综合例子
if __name__ == '__main__':
from Tkinter import *
canvas = Canvas(width = 300,height = 300,bg = 'green')
canvas.pack(expand = YES,fill = BOTH)
x0 = 150
y0 = 100
canvas.create_oval(x0 - 10,y0 - 10,x0 + 10,y0 + 10)
canvas.create_oval(x0 - 20,y0 - 20,x0 + 20,y0 + 20)
canvas.create_oval(x0 - 50,y0 - 50,x0 + 50,y0 + 50)
import math
B = 0.809
for i in range(16):
a = 2 * math.pi / 16 * i
x = math.ceil(x0 + 48 * math.cos(a))
y = math.ceil(y0 + 48 * math.sin(a) * B)
canvas.create_line(x0,y0,x,y,fill = 'red')
canvas.create_oval(x0 - 60,y0 - 60,x0 + 60,y0 + 60)
for k in range(501):
for i in range(17):
a = (2 * math.pi / 16) * i + (2 * math.pi / 180) * k
x = math.ceil(x0 + 48 * math.cos(a))
y = math.ceil(y0 + 48 + math.sin(a) * B)
canvas.create_line(x0,y0,x,y,fill = 'red')
for j in range(51):
a = (2 * math.pi / 16) * i + (2* math.pi / 180) * k - 1
x = math.ceil(x0 + 48 * math.cos(a))
y = math.ceil(y0 + 48 * math.sin(a) * B)
canvas.create_line(x0,y0,x,y,fill = 'red')
mainloop()
eg60:计算字符串长度
sStr1 = 'strlen'
print(len(sStr1))
eg61:打印出杨辉三角形
from sys import stdout
def yhSJ():
a = []
for i in range(10):
a.append([])
for j in range(10):
a[i].append(0)
for i in range(10):
a[i][0] = 1
a[i][i] = 1
for i in range(2,10):
for j in range(1,i):
a[i][j] = a[i-1][j-1]+a[i-1][j]
for i in range(10):
for j in range(0,i+1):
stdout.write(str(a[i][j]))
stdout.write(' ')
print()
yhSJ()
eg62:查找字符串
sStr1 = 'abcdefgcde'
sStr2 = 'cde'
print (sStr1.find(sStr2))
eg63:画椭圆
if __name__ == '__main__':
from tkinter import *
x = 360
y = 160
top = y - 30
bottom = y - 30
canvas = Canvas(width = 400,height = 600,bg = 'white')
for i in range(20):
canvas.create_oval(250 - top,250 - bottom,250 + top,250 + bottom)
top -= 5
bottom += 5
canvas.pack()
mainloop()
eg64:利用ellipse 和 rectangle 画图
if __name__ == '__main__':
from tkinter import *
canvas = Canvas(width = 400,height = 600,bg = 'white')
left = 20
right = 50
top = 50
num = 15
for i in range(num):
canvas.create_oval(250 - right,250 - left,250 + right,250 + left)
canvas.create_oval(250 - 20,250 - top,250 + 20,250 + top)
canvas.create_rectangle(20 - 2 * i,20 - 2 * i,10 * (i + 2),10 * ( i + 2))
right += 5
left += 5
top += 10
canvas.pack()
mainloop()
eg65:一个最优美的图案
import math
from tkinter import *
class PTS:
def __init__(self):
self.x = 0
self.y = 0
points = []
def LineToDemo():
screenx = 400
screeny = 400
canvas = Canvas(width = screenx,height = screeny,bg = 'white')
AspectRatio = 0.85
MAXPTS = 15
h = screeny
w = screenx
xcenter = w / 2
ycenter = h / 2
radius = (h - 30) / (AspectRatio * 2) - 20
step = 360 / MAXPTS
angle = 0.0
for i in range(MAXPTS):
rads = angle * math.pi / 180.0
p = PTS()
p.x = xcenter + int(math.cos(rads) * radius)
p.y = ycenter - int(math.sin(rads) * radius * AspectRatio)
angle += step
points.append(p)
canvas.create_oval(xcenter - radius,ycenter - radius,
xcenter + radius,ycenter + radius)
for i in range(MAXPTS):
for j in range(i,MAXPTS):
canvas.create_line(points[i].x,points[i].y,points[j].x,points[j].y)
canvas.pack()
mainloop()
eg66:输入3个数a,b,c,按大小顺序输出
import re
def swap(n1,n2):
return n2,n1
def sort():
a = input("please input three num:")
str = list(map(int,re.split('\s',a)))
if str[0]>str[1] : str[0],str[1] = swap(str[0],str[1])
if str[0]>str[2] : str[0],str[2] = swap(str[0],str[2])
if str[1]>str[2] : str[1],str[2] = swap(str[1],str[2])
print(str)
sort()
eg67:输入数组,最大的与第一个元素交换,最小的与最后一个元素交换,输出数组
import re
def inputStr():
array = list(map(int,re.split('\s',input("please input a array:"))))
return array
def max_exchange(array):
max = 0
for i in range(1,len(array)):
if array[i]>array[max] :
max = i
else:
continue
k = array[0]
array[0] = array[max]
array[max] = k
return array
def min_exchange(array):
min = 0
for i in range(1,len(array)):
if array[i]<array[min] :
min = i
else:
continue
k = array[len(array)-1]
array[len(array)-1] = array[min]
array[min] = k
return array
def output():
array = max_exchange(inputStr())
print(array)
print(min_exchange(array))
output()
eg68:有 n 个整数,使其前面各数顺序向后移 m 个位置,最后 m 个数变成最前面的 m 个数
import re
def moveStep(array, m):
array_end = array[len(array) - 1]
for i in range(len(array) - 2, -1, -1):
array[i + 1] = array[i]
array[0] = array_end
m -= 1
if m >= 0:
moveStep(array, m)
def move():
array = list(map(int,re.split('\s',input("please input a array:"))))
m = int(input('please input the move step num:'))
moveStep(array,m)
print(array)
move()
eg69:有n个人围成一圈,顺序排号。从第一个人开始报数(从1到3报数),凡报到3的人退出圈子,问最后留下的是原来第几号的那位
def leaveNum():
n = int(input('请输入总人数 :'))
num = []
for i in range(1,n+1):
num.append(i)
k = 0
m = 0
i = 0
while m < n-1:
if num[i] != 0:
k+=1
if k == 3:
num[i] = 0
k = 0
m+=1
i+=1
if i == n:
i = 0
i = 0
while num[i] == 0:
i+=1
print(num[i])
leaveNum()
eg70:写一个函数,求一个字符串的长度,在main函数中输入字符串,并输出其长度
def length():
str = input("please input your str:")
print("the str has %d characters"%len(str))
length()
eg71:编写input()和output()函数输入,输出5个学生的数据记录
N = 3
student = []
for i in range(5):
student.append(['', '', []])
def input_stu(stu):
for i in range(N):
stu[i][0] = input('input student num:\n')
stu[i][1] = input('input student name:\n')
for j in range(3):
stu[i][2].append(int(input('score:\n')))
def output_stu(stu):
for i in range(N):
print('%-6s%-10s' % (stu[i][0], stu[i][1]))
for j in range(3):
print('%-8d' % stu[i][2][j])
if __name__ == '__main__':
input_stu(student)
print(student)
output_stu(student)
eg72:创建一个链表
if __name__ == '__main__':
ptr = []
for i in range(5):
num = int(input('please input a number:\n'))
ptr.append(num)
print(ptr)
eg73:反向输出一个链表
if __name__ == '__main__':
ptr = []
for i in range(5):
num = int(input('please input a number:\n'))
ptr.append(num)
print(ptr)
ptr.reverse()
print(ptr)
eg74:列表排序及连接
if __name__ == '__main__':
a = [1, 3, 2]
b = [3, 4, 5]
a.sort()
print(a)
print(a + b)
a.extend(b)
print(a)
eg75:放松一下,算一道简单的题目
if __name__ == '__main__':
for i in range(5):
n = 0
if i != 1: n += 1
if i == 3: n += 1
if i == 4: n += 1
if i != 4: n += 1
if n == 3: print(64 + i)
eg76:编写一个函数,输入n为偶数时,调用函数求1/2+1/4+…+1/n,当输入n为奇数时,调用函数1/1+1/3+…+1/n
def sum():
n = int(input("please input a num:"))
t = 2
sum = 0
if n % 2 == 0:
while t <= n:
sum += 1.0 / t
t += 2
print("the sum is:", sum)
elif n % 2 != 0:
while t<=n:
sum += 1.0 / t
t += 2
print("the sum is:", sum)
else:
print("you print a invalid num")
sum()
eg77:循环输出列表
if __name__ == '__main__':
s = ["man","woman","girl","boy","sister"]
for i in range(len(s)):
print(s[i])
eg78:找到年龄最大的人,并输出。请找出程序中有什么问题
if __name__ == '__main__':
person = {
"li":18,"wang":50,"zhang":20,"sun":22}
m = 'li'
for key in person.keys():
if person[m] < person[key]:
m = key
print '%s,%d' % (m,person[m])
eg79:字符串排序
if __name__ == '__main__':
str1 = input('input string:\n')
str2 = input('input string:\n')
str3 = input('input string:\n')
print(str1, str2, str3)
if str1 > str2: str1, str2 = str2, str1
if str1 > str3: str1, str3 = str3, str1
if str2 > str3: str2, str3 = str3, str2
print('after being sorted.')
print(str1, str2, str3)
eg80:海滩上有一堆桃子,五只猴子来分。第一只猴子把这堆桃子平均分为五份,多了一个,这只猴子把多的一个扔入海中,拿走了一份。第二只猴子把剩下的桃子又平均分成五份,又多了一个,它同样把多的一个扔入海中,拿走了一份,第三、第四、第五只猴子都是这样做的,问海滩上原来最少有多少个桃子?
def taozi():
x = 0
j = 1
i = 0
while i < 5:
x = j * 4
for i in range(5):
if x % 4 != 0:
break
else:
x = ( x /4 ) * 5 +1
i += 1
j += 1
return x
print(taozi())
eg 81:809*??=800*??+9*?? 其中??代表的两位数, 809*??为四位数,8*??的结果为两位数,9*??的结果为3位数。求??代表的两位数,及809*??后的结果
def answer():
for i in range(10,100):
if (809 * i / 1000 >= 1) and (8 * i / 10 >= 1) and (9 * i /100 >= 1):
print("?? is %d, 809 * ?? is %d"%(i,809*i))
break
else:
continue
answer()```
```python
connect = ' '
list = ['my','monther','is','a','beautiful','woman']
print(connect.join(list))
eg82:八进制转换为十进制
if __name__ == '__main__':
n = 0
p = input('input a octal number:\n')
for i in range(len(p)):
n = n * 8 + ord(p[i]) - ord('0')
print(n)
eg83:求0—7所能组成的奇数个数
def jishu():
sum = 4
s = 4
for i in range(2,9):
if i <= 2:
s = s * 7
else:
s = s * 8
sum = sum + s
print('sum is %d'%sum)
jishu()
eg84:
connect = ' '
list = ['my','monther','is','a','beautiful','woman']
print(connect.join(list))
eg85:输入一个奇数,然后判断最少几个 9 除于该数的结果为整数
n = int(input('please input a odd num: '))
if n % 2 == 0:
n = int(input('please input a odd num: '))
result = True
t = 1
i = 9
while result:
if i % n == 0:
result = False
print('需要至少 %d 个9除于 %d 能除尽'%(t,n))
else:
i = i * 10 + 9
t += 1
eg86:两个字符串连接程序
a = 'my monther'
b = ' is beautiful'
c = a + b
print(c)
eg87:回答结果(结构体变量传递)
if __name__ == '__main__':
class student:
x = 0
c = 0
def f(stu):
stu.x = 20
stu.c = 'c'
a= student()
a.x = 3
a.c = 'a'
f(a)
print(a.x,a.c)
eg88:读取7个数(1—50)的整数值,每读取一个值,程序打印出该值个数的*
def dushu():
for i in range(7):
print('The %d th'%(i+1))
n = int(input('please input a num range in 1-50: '))
for j in range(n):
print('*',end=' ')
if (j+1) % 5 == 0:
print()
print()
dushu()
eg89:某个公司采用公用电话传递数据,数据是四位的整数,在传递过程中是加密的,加密规则如下:每位数字都加上5,然后用和除以10的余数代替该数字,再将第一位和第四位交换,第二位和第三位交换
def jiami(n):
a = n % 10
b = n % 100 // 10
c = n % 1000 // 100
d = n // 1000
return a,b,c,d
n = int(input('please input a num: '))
a,b,c,d = jiami(n)
a = ( a + 5 ) % 10
b = ( b + 5 ) % 10
c = ( c + 5 ) % 10
d = ( d + 5 ) % 10
t = a * 1000 + b * 100 + c * 10 + d
print('the last num is : ',t)
eg90:列表使用实例
testList = [10086, '中国移动', [1, 2, 4, 5]]
print(len(testList))
print(testList[1:])
testList.append('i\'m new here!')
print(len(testList))
print(testList[-1])
print(testList.pop(1))
print(len(testList))
print(testList)
matrix = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]
print(matrix)
print(matrix[1])
col2 = [row[1] for row in matrix]
print(col2)
col2even = [row[1] for row in matrix if row[1] % 2 == 0]
print(col2even)
eg91:时间函数举例1
if __name__ == '__main__':
import time
print(time.ctime(time.time()))
print(time.asctime(time.localtime(time.time())))
print(time.asctime(time.gmtime(time.time())))
eg92:时间函数举例2
if __name__ == '__main__':
import time
start = time.time()
for i in range(3000):
print(i)
end = time.time()
print(start)
print(end)
print(end - start)
eg93:时间函数举例3
if __name__ == '__main__':
import time
start = time.process_time()
for i in range(10000):
print(i)
end = time.process_time()
print(start)
print(end)
print('different is %6.3f' % (end - start))
eg94:时间函数举例4,一个猜数游戏,判断一个人反应快慢
if __name__ == '__main__':
import time
import random
play_it = input('do you want to play it.(\'y\' or \'n\')')
while play_it == 'y':
c = input('input a character:\n')
i = random.randint(0, 2 ** 32) % 100
print('please input number you guess:\n')
start = time.process_time()
a = time.time()
guess = int(input('input your guess:\n'))
while guess != i:
if guess > i:
print('please input a little smaller')
guess = int(input('input your guess:\n'))
else:
print('please input a little bigger')
guess = int(input('input your guess:\n'))
end = time.process_time()
b = time.time()
var = (end - start) / 18.2
print(var)
if var < 15:
print('you are very clever!')
elif var < 25:
print('you are normal!')
else:
print('you are stupid!')
print('Congradulations')
print('The number you guess is %d' % i)
play_it = input('do you want to play it.')
eg95:字符串日期转换为易读的日期格式
from dateutil import parser
from dateutil.rrule import *
dt = parser.parse("Aug 12 2012 00:00AM")
print(dt)
print(parser.parse("Wed, Aug 12"))
print(parser.parse('2021-08-12'))
print(parser.parse('2021,08,12'))
print(parser.parse('I think 2021-08-12 08:00:00 is a fun day',fuzzy = True))
print(list(rrule(DAILY,dtstart=parse('2021-08-01'),until=parse('2021-08-12'))))
print(list(rrule(DAILY,interval=3,dtstart=parse('2021-08-01'),until=parse('2021-08-12'))))
print(list(rrule(DAILY,count=3,dtstart=parse('2021-08-01'),until=parse('2021-08-12'))))
print(list(rrule(DAILY,byweekday=(MO,TU),dtstart=parse('2021-08-01'),until=parse('2021-08-12'))))
print(list(rrule(MONTHLY,dtstart=parse('2021-08-01'),until=parse('2021-08-12'))))
eg96:计算字符串中子串出现的次数
if __name__ == '__main__':
str1 = input('请输入一个字符串:\n')
str2 = input('请输入一个子字符串:\n')
ncount = str1.count(str2)
print(ncount)
eg97:从键盘输入一些字符,逐个把它们写到磁盘文件上,直到输入一个 # 为止
from sys import stdout
with open('test12082021','w') as fp:
chr = input('please input a character: ')
while chr != '#':
fp.write(chr)
fp.write(' ')
stdout.write(chr)
print()
chr = input('please input a character: ')
eg98:从键盘输入一个字符串,将小写字母全部转换成大写字母,然后输出到一个磁盘文件"test"中保存
with open('test12082021','w') as fp:
chr = input('please input a lower case letter: ')
fp.write(chr.upper())
with open('test12082021','r') as fp:
print(fp.read())
eg99:有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并(按字母顺序排列), 输出到一个新文件C中
with open('testA12082021','r') as fp:
a = fp.read()
with open('testB12082021','r') as fp:
b = fp.read()
with open('testC12082021','w') as fp:
c = list(a + b)
c.sort()
con = ','
c = con.join(c)
print(type(c))
fp.write(c)
eg100:列表转换为字典
i = ['a', 'b']
l = [1, 2]
print(dict([i,l]))