Python学习笔记--day01

# 循环三要素：
# 1.初始化数据
# 2.循环的条件
# 3.在循环过程中，如何改变循环条件
i = 1
while i <= 100:
    print(i)
    i = i + 1

从键盘获取一个路径，判断此目录是否存在，不存在则创建，存在则提示

import os

dirPath = input("请您输入您需要检测的路径：")
if os.path.exists(dirPath) :
    pass
else:
    os.makedirs(dirPath)
    print("创建成功")

输入一个年份，判断是否是闰年

# 1.输入一个年份 input()
year = input("请您输入一个年份：")
# 2.上述输入的年份是一个字符串，需要转换为int
year = int(year)
# 3.判断是否是闰年：1.能被4整除，并且不能被100整除
#                    2.能被400整除

if year % 4 == 0 and year % 100 != 0:
    print("此数是闰年")
elif year % 400 == 0:
    print("次数是闰年")
else:
    print("此数非闰年")

求1-100的和

sum = 0
i = 1
while i <= 100:
    sum = sum + i
    i = i + 1

print("1-100 的和:{}".format(sum))

0-100的质数的输出

i = 1
while i <= 100:
    isZhi = True
    x = 2
    while x <= i - 1:
        if i % x == 0:
            isZhi = False
            break
        x = x + 1
    if isZhi == True:
        print("{}是质数".format(i))
    i = i + 1

99乘法口诀表

# 一共9行  *
# n行有n列 *
# 列 * 行 = 结果
#每一行结束换行 ，每一个表达式结束以后则空\t
row = 1
while row <= 9:
    col = 1
    while col <= row:
        print("{} * {} = {} ".format(col,row,col*row),end='\t')
        col = col + 1
    print()
    row = row + 1

猜拳游戏

import random
while True:
    print("0剪刀 1石头 2布 q退出")

    # 玩家出拳
    choose = input("请您出拳：")
    if choose == 'q':
        print("感谢您的使用，欢迎下次再来!")
        break
    if choose not in ['0','1','2']:
        print("您输入有误，请检查\n")
        continue

    # 电脑出拳
    computer = str(random.randint(0,2))

    # 玩家展示
    playerChoose = ""
    if choose == "0":
        playerChoose = "✄"
    elif choose == "1":
        playerChoose = "☭"
    else:
        playerChoose = "❁"

    # 电脑展示
    computerChoose = ""
    if computer == "0":
        computerChoose = "✄"
    elif computer == "1":
        computerChoose = "☭"
    else:
        computerChoose = "❁"

    print("玩家： {} VS ：{} 电脑".format(playerChoose,computerChoose))

    if (choose == "0" and computer == "2") or (choose == "1" and computer == "0") or (choose == "2" and computer == "1"):
        print("玩家胜！")
    elif(choose == str(computer)):
        print("平局")
    else:
        print("电脑胜")
    print()

从键盘获取一个数字n，获取其1-n之间所有不包含7的数字，并打印出来

num = input("请您输入一个数字：")
num = int(num)

i = 1
while i <= num:
    if "7" not in str(i):
        print(i)
    i += 1

统计字符串中大小写字母的数量

str = "jskdhLKSAFLKFlksdjflkasjf"
bigNum  = 0
smallNum = 0
i = 0
while i < len(str):
    if str[i].isupper():
        bigNum += 1
    else:
        smallNum += 1
    i += 1
print("大写字母的数量：{}".format(bigNum))
print("小写字母的数量：{}".format(smallNum))