Python-字符串相关方法

s = 'hello' 
print(len(s)) # 5

s = 'Hello'
print(s.lower()) # hello 
print(s.upper()) # HELLO

s = ' hello '
print(s.strip()) # 'hello'

s = ' hello ' 
print(s.lstrip()) # 'hello '
print(s.rstrip()) # ' hello'

s = 'hello world'
print(s.count('l')) # 3

s = 'hello world'
print(s.replace('world', 'Python')) # 'hello Python'

s = 'hello world' 
print(s.split()) # ['hello', 'world']

s = '-'
seq = ['a', 'b', 'c'] 
print(s.join(seq)) # 'a-b-c'

s = 'hello world'
print(s.find('l')) # 2

s = 'hello world'
print(s.index('l')) # 2

s = 'hello world' 
print(s.startswith('he')) # True

s = 'hello world'
print(s.endswith('ld')) # True