1.
list = [1, 2, 3, 4, 5, 2, 6, 7, 2]
pos = 0
for i in range(list.count(2)):
if pos == 0:
pos = list.index(2)
else:
pos = list.index(2, pos + 1)
print 'find pos: ', pos
2.
#递归n的阶乘
def factorial(n):
if n == 1:
return 1
else:
return n * factorial(n-1)
print factorial(10)
def factorial(n):
i = 1
if n > 1:
i = n
n = n * factorial(n-1)
print "%d! = " %i, n
return n
factorial(10)
from functools import reduce
print "10! =", reduce(lambda x, y: x * y, range(1, 11))
3.
#定义一个函数，实现输入n，输出0-n之间的所有素数
def isPrime(n):
for i in range(0, n + 1):
if i == 0:
print i, 'is not prime'
elif i == 1:
print i, 'is not prime'
else:
for j in range(2, i):
if i % j == 0:
print i, 'is not prime'
break
else:
print i, 'is prime'
isPrime(100)
4.
#判断一个数是否为素数
def isPrime(n):
if n > 1:
for i in range(2, n):
if n % i == 0:
print n, 'is not prime'
break
else:
print n, 'is prime'
else:
print n, 'is not prime'
isPrime(100)
5.
#可变参数列表
def test(tep, *args):
print args
test(1, 2, 3, 4, 5)
6.
#关键字参数
def parrot(voltage, state='a stiff', action='voom', type='Norwegian Blue'):
print "-- This parrot wouldn't", action,
print "if you put", voltage, "volts through it."
print "-- Lovely plumage, the", type
print "-- It's", state, "!"
parrot(1000) # 1 positional argument
parrot(voltage=1000) # 1 keyword argument
parrot(voltage=1000000, action='VOOOOOM') # 2 keyword arguments
parrot(action='VOOOOOM', voltage=1000000) # 2 keyword arguments
parrot('a million', 'bereft of life', 'jump') # 3 positional arguments
parrot('a thousand', state='pushing up the daisies') # 1 positional, 1 keyword
7.
#默认参数值
def ask_ok(prompt, retries=4, complaint='Yes or no, please!'):
while True:
ok = raw_input(prompt)
if ok in ('y', 'ye', 'yes'):
return True
if ok in ('n', 'no', 'nop', 'nope'):
return False
retries = retries - 1
if retries < 0:
raise IOError('refusenik user')
print complaint
#ask_ok('Do you really want to quit?')
#ask_ok('OK to overwrite the file?', 2)
ask_ok('OK to overwrite the file?', 2, 'Come on, only yes or no!')
8.
# write Fibonacci series up to n
def fib(n):
"""Print a Fibonacci series up to n."""
a, b = 0, 1
while a < n:
print a,
a, b = b, a+b
# Now call the function we just defined:
fib(2000)
fibs = [0, 1]
num = input('How many Fibonacci numbers do you want? ')
for i in range(num - 2):
fibs.append(fibs[-2] + fibs[-1])
print fibs
9.
#!/usr/bin/env python
#-*- coding: utf-8 -*-
import sys
count = 0
while True:
print u"选择你要暂停的行: ",
print_num = input('')
while count < 500:
if print_num <= count:
if print_num == count:
print u"你要暂停的行为 ", print_num
print u"是否要继续(y/n)",
choice = raw_input('')
if choice == 'n':
sys.exit()
else:
break
else:
if print_num <= count:
print u"已经过去了"
break
else:
count +=1
print '现在是第%d行 ' %count
10.
#!/usr/bin/env python
#-*- coding: utf8 -*-
print_num = input('Which loop do you want it to be printed out?')
count = 0
while count < 10000000:
if count == print_num:
print 'There you get the number:', count
choice = raw_input('Do you want to continue the loop?(y/n)')
if choice == 'n':
break
else:
while print_num <= count:
print_num = input('Which loop do you want it to be printed out?')
if print_num <= count:
print u"已经过了"
else:
print 'Loop:', count
count +=1
else:
print 'Loop:', count
11.
#!-*- coding: utf-8 -*-
#!/usr/bin/env python
import sys
import os
retry_limit = 3
retry_count = 0
account_file = 'account.txt'
lock_file = 'account_lock.txt'
while retry_count < retry_limit:
username = raw_input('\033|32;1mUsername: \033|0m')
lock_check = file(lock_file)
for line in lock_check.readlines():
line = line.split()
if username == line[0]:
sys.exit('\033|31;1mUsername %s is locked!\033|0m')
password = raw_input('\033|32;1mPassword:\033|0m')
f = file(account_file, 'rb')
match_flag = False
for line in f.readlines():
user, passwd = line.strip('\n').split()
if username == user and password == passwd:
print 'Match!', username
match_flag = True
break
f.close()
if match_flag == False:
print 'User unmatched!'
retry_count +=1
else:
print "Welcom login OldBoy Learning system!"
else:
print "Your account is locked!"
f = file(lock_file, 'ab')
#f.write(username + "\r\n")
f.write('%s%s' %(username,os.linesep))
f.close()
12.
#词频统计
import string
with open('words.txt','r') as text:
words = [raw_word.strip(string.punctuation).lower() for raw_word in text.read().split()]
words_index = set(words)
counts_dict = {index:words.count(index) for index in words_index}
for word in sorted(counts_dict,key=lambda x: counts_dict[x],reverse=True):
print '{} -- {} times'.format(word,counts_dict[word])
13.
#sorted函数按value值对字典排序
dic = {'a':31, 'bc':5, 'c':3, 'asd':4, '33':56, 'd':0}
print sorted(dic.iteritems(), key=lambda d:d[1], reverse = False)
print sorted(dic.iteritems(), key=lambda d:d[0], reverse = False)
print sorted(dic.items(), key=lambda d:d[1], reverse = False)
print sorted(dic.items(), key=lambda d:d[0], reverse = False)
print sorted(dic, key=lambda d:dic[d] reverse = False)
14.
#字符串的反转
def reverse(s):
return s[::-1]
s = "hello world"
print reverse(s)
15.
#字符串与日期的转换
import time
import datetime
print time.strftime("%Y-%m-%d %X", time.localtime())
t = time.strptime("2008-08-08", "%Y-%m-%d")
y, m, d = t[0:3]
print datetime.datetime(y, m, d)
16
#正则表达式示例
import re
pattern = re.compile(r"[(]?\d{3}[)-]?\d{8}")
match = pattern.match("(755)12345678")
if match:
print match.group()
