print(‘how are you?,it\‘s ok‘.find(‘are‘))

title = ‘everything has two sides‘

print(title.find(‘s‘))#返回的是子串所在位置的最左端索引
print(title.find(‘everything‘))
print(title.find(‘you‘)) #如果没有就会返回-1

title = ‘everything has two sides‘
print(title.find(‘e‘,4,17))#还可以提供查找的范围

str = "-"
seq = (‘1‘,‘2‘,‘3‘,‘4‘,‘5‘) # 字符串序列
print(str.join( seq ))

print(‘TOMMORROW IS LEFT‘.lower())

name = ‘JACK‘
names = [‘jack‘,‘jay‘,‘jane‘]
if name in names:
    print(‘find it‘)
elif name.lower() in names:
    print(‘very good‘)
else:
    print(‘nothing‘)

print(‘i love you‘.replace(‘you‘,‘nothing‘))

print(‘1+2+3+4+5‘.split(‘+‘))
print(‘/usr/bin/env‘.split(‘/‘))
print(‘hello world‘.split())  # 如果不提供分隔符，程序会把所有的空格作为分隔符

print(‘             hello  world                      ‘.strip())