字符串常用操作总结

center(self, width, fillchar=None)

count(self, sub, start=None, end=None)

encode(self,encoding='utf-8', errors='strict')

endswith(self, suffix, start=None, end=None)

find(self, sub, start=None, end=None)

isdigit(self)

replace(self, old, new, count=None)

split(self, sep=None, maxsplit=-1)

strip(self, chars=None)

a = 'hello world'

print(a.center(50, '-'))
# output: -------------------hello world--------------------

print(a.count('l', 2, -1))
# output: 3

print(a.startswith('h'))
# 判断开头字符

print(a.endswith('h'))
# 判断结尾字符

print(a.find("l"))
# 找到返回所查字符索引 -1为未找到

print("22".isdigit())
# 判断是否是整数

l = ["alex", "black girl", "peiqi"]
print("-".join(l)) # 拼接字符串， alex-black girl-peiqi

print(a.replace('l', 'L', 2))
# heLLo world