1.isdigit=indecimal (judging whether it is a number)
s="123"
print(s.isdigit())
The output is: True
2.format(identifier)
a =("I have a {0},My name is {1}").format("dog","gao")
print(a)
The output is: I have a dog,My name is gao
3.join (splicing the list into a string, separated by --)
a =["bbb","aaa","ccc"]
print("--".join(a))
Output: ("bbb--aaa--ccc")
4.strip (remove the spaces, newlines, and Tabs on the left and right sides of the string)
s=" aaa "
print(s.strip())
Output: (aaa)
5.replace (replace)
s="Hello World"
print(s.replace("o","a",2)) Replace o with a and replace 2 with o
Output: Hella Warld
6.find (find index)
s="Hello World"
print(s.find("o",0,5)) find the index of o in 0-5
output 4
7.split (split)
s="Hello World"
print(s.split("o",1)) split by an o
Output: ['Hell', 'World']
8.center
s="Hello World"
print(s.center(30,"-")) generates a title with a length of 30 and a - on both sides
Output:---------Hello World----------
9.count (number)
s="Hello World"
print(s.count("o",0,5)) Count o between 0-5
output: 1