Python Tutorial - String Case Conversion

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In Python, to facilitate case conversion of letters in strings, string variables provide three functions:

  • title functions
  • lower functions
  • upper functions

Python Title Function

The title function is used to convert the first letter of each word in the string to uppercase, and all other letters to lowercase. After the conversion is complete, this method returns the converted string. If there are no characters in the string that need to be converted, this method returns the string intact.

The syntax of the title function is as follows:


Where str represents the string to be converted.


#convert first letter of each word in the string to uppercase
string = ""
#no character in the string that need to be converted
string = "NICE TO MEET YOU"

The output is:

'Nice To Meet You'

Python Lower Function

The lower function is used to convert all uppercase letters in the string to lowercase letters. After the conversion is completed, the method returns the newly obtained string. If the string is already lowercase, the method returns the original string.

The syntax of the lower function is as follows:


Where str represents the string to be converted.


string = “NICE TO MEET YOU”

The output is:

'nice to meet you'

Python Upper Function

The function of upper() is exactly the opposite of the lower(). It is used to convert all lowercase letters in the string to uppercase letters. The return method is the same as the above two methods, that is, if the conversion is successful, a new string is returned; Otherwise, the original string is returned.

The syntax of the upper function is as follows:


Where str represents the string to be converted.


string = "nice to meet you"
# convert all lowercase letters in the string to uppercase letters

The output is:



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