python3字符串string 方法示例

-*- coding: utf-8 -*-

import string

strip去除空格

s = ' abcd efg  '
print(s.strip())
print(s.lstrip())
print(s.rstrip())

大寫小

s = 'abc defg'
print(s.upper())
print(s.upper().lower())
print(s.capitalize())

位置和比較

s_1 = 'abcdefg'
print(s_1.index('bcd'))

分割和連接

s = 'abc,def,ghi'
print(s.split(','))
s = '123\n456\n789'
numbers = s.splitlines()
print(numbers)
print('-'.join(numbers))

常用判斷

s = 'abcdefg'
print(s.startswith('abc'))
print(s.endswith('efg'))
print('abcd1234'.isalnum())
print('\tabcd1234'.isalnum())
print('abcd'.isalpha())
print('12345'.isdigit())
print('  '.isspace())
print('acb125'.islower())
print('A1B2C'.isupper())
print('Hello world!'.istitle())

格式化字符串

print('Hello %s!' % 'world')
print('%d-%.2f-%s' % (4, -2.3, 'hello'))