字符串类型内置方法

按索引取值

name='yryriw 9999ndlaanl'
print(name[0])
print(name[-1])

切片:步长为正数,从左到右切片;如果步长为负数

print(name[0:7])
print(name[0:7:2])
print(name[0::2])
print(name[-4::1])

print(name[-4👎1])
print(name[-4👎-1])

print(name[-1:-4:-1])#如果步长为负数，则起始索引应该比结束索引大，这样切片操作才能从右向左提取子字符串。

长度len

print(len(name))
print('*' * 50)

成员运算in|not in

print('999'in name)
print('irw'in name)
print('iw 9'in name)
print('iw9'in name)

print('*' * 50)

移除空白strip:移除两端的空格

print(name.strip())
print(name.strip('lannel yryr'))
print('*' * 50)

切分/割split

print(name.split())
print(name.split('yryr'))
print('*' * 50)

循环

for i in name:
print(i)
print('*' * 50)
name_list=[1,2,3,4]
for i in name_list:
print(i)