Changes in uppercase and lowercase letters in Python strings

If you have any questions about Python string operations, you can click here. This article describes how to perform Python string operations. The following is a detailed introduction to the article, I hope you will gain some benefits after reading the following article.

Case-insensitive conversion of characters in a string:

 
 

  
  
* S.lower()  
 
 

Lowercase

 
 

  
  
* S.upper()   
 
 

Uppercase

 
 

  
  
* S.swapcase()  
 
 

Case-insensitive swap

 
 

  
  
* S.capitalize() 
 
 

Uppercase letters

 
 

  
  
* String.capwords(S)   
 
 

This is the method in the module. It separates S with the split () function, converts the first letter into upper-case letters with capitalize (), and finally merges them with join ().

 
 

  
  
* S.title() 
 
 

Only the first letter is in upper case, and the rest are in lower case. The module does not have the alignment of this method string in the output:

 
 

  
  
* S.ljust(width,[fillchar])   
 
 

The output width is a string of characters, and the S is left aligned. The missing part is filled with fillchar. The default value is space.

 
 

  
  
* S.rjust(width,[fillchar])   
 
 

Right alignment

 
 

  
  
* S.center(width, [fillchar])  
 
 

Center alignment

 
 

  
  
* S.zfill(width) 
 
 

Change S to width length, and align it on the right. Fill the remaining part with 0.