Python string manipulation

1. Capitalize the first letter of the string

>>> name = "Xiaoming"

>>> print (Name.capitalize ())//capitalize method to capitalize the first letter of a string

Xiaoming

2. Count the number of characters in the string

>>> name = "Xiaoming"

>>> Print (Name.count ("I"))

2

3. Repeat to print a character

>>> Print (Name.center (20, "-"))//A total of 20 characters, put "xiaoming" in the middle

------xiaoming------

4. Judge what the string ends with

>>> name = "Xiaoming"

>>> Print (Name.endswith ("ng"))

True

5. Find index position according to character

>>> name = "My name is Xiaoming"

>>> Print (Name.find ("is"))//find only the position of the beginning letter of the found character

8

>>> Print (Name[name.find ("is"):])//string also supports slicing

Is Xiaoming

6. Formatted output of string

>>> name = "My name is {name} and I am {year} years old."

>>> Print (Name.format (name= "Xiaoming", year=20))//format formatted output

My name is xiaoming and I am-years old.

>>> print ({"Name": "Xiaoming", "Year": Name.format_map})//format_map can be transferred in a dictionary format

My name is xiaoming and I am years old.

7, judge the string is not a pure English character composition

>>> name = "ABC"

>>> print (Name.isalpha ())

True

>>> name = "AB12"

>>> print (Name.isalpha ())

False

8. Determine if the number is an integer

>>> print ("AA". IsDigit ())

False

>>> print ("one"). IsDigit ())

True

>>> print ("11.2". IsDigit ())

False

9. Determine if the string is lowercase

>>> name = "ABC"

>>> print (Name.islower ())

True

>>> name = "My"

>>> print (Name.islower ())

False

10. Determine if a character in a string begins with an uppercase letter

>>> name = "My Name"

>>> print (Name.istitle ())

False

>>> name = "My name"

>>> print (Name.istitle ())

True

11. Determine if the string is all uppercase letters

>>> name = "MY name"

>>> print (Name.isupper ())

True

12. Simple use of Join

>>> print ("". Join (["1", "2", "3"])

123

>>> print ("+". Join (["1", "2", "3"])

1+2+3

13. Use of Ljust () and Rjust ()

>>> Name

' MY NAME '

>>> Print (Name.ljust (20, "*"))//Note: is the entire string length, "MY name" is a total of 7, so "*" only 13

MY name*************

>>> Print (Name.rjust (20, "*"))

MY NAME

14. Case Conversion of strings

>>> Name

' MY NAME '

>>> print (Name.lower ())//lower is to turn uppercase into lowercase

My Name

>>> print (Name.upper ())//upper is to convert lowercase to uppercase

MY NAME

15. Remove the carriage return or space at both ends of the string

>>> print ("\nmy name")

My Name

>>> print ("\nmy name". Lstrip ())//lstrip to remove spaces or carriage returns to the left of the string

My Name

>>> print ("My name\n")

My Name

>>> print ("My name\n". Rstrip ())//rstrip to remove the space to the right of the string or enter

My Name

>>> print ("\nmy name\n". Strip ())//strip to remove spaces or carriage returns from both ends

My Name

16. Substitution of characters

>>> print ("ABCA". Replace ("A", "L"))//default = Replace All

Lbcl

>>> print ("ABCA". Replace ("A", "L", 1))//You can specify

Lbca

17. String segmentation into a list

>>> print ("My name is Xiaoming". Split ())//default is a space

[' My ', ' name ', ' is ', ' xiaoming ']

>>> print ("My name is Xiaoming". Split ("I"))//You can specify a delimiter

[' My name ', ' s X ', ' aom ', ' ng ']

18, Swapcase, the lowercase in the string to uppercase, uppercase to lowercase

>>> print ("My name is". Swapcase ())

MY NAME is

Python string manipulation