Méthode d'utilisation et exemple de replace() de la chaîne de caractères Python

Python string methods

La méthode replace() remplace old (l'ancien chaîne de caractères) par new (nouveau chaîne de caractères) dans la chaîne de caractères, si le troisième paramètre count est spécifié, le remplacement ne peut pas dépasser count fois.

La syntaxe de replace() est :

str.replace(old, new[, count])

Paramètres de replace()

Le méthode replace() peut utiliser au plus3paramètres :

• old -L'ancien sous-chaine que vous souhaitez remplacer

• new -Le nouveau sous-chaine remplacera l'ancien sous-chaine

• count(Optional)-The number of times you want to replace the old substring with the new substring

If count is not specified, the replace() method replaces all occurrences of the old substring with the new substring.

replace() return value

The replace() method returns a copy of the string where the old substring is replaced by the new substring. The original string remains unchanged.

If the old substring is not found, a copy of the original string is returned.

Example1How to use replace()?

song = 'cold, cold heart'
print(song.replace('cold', 'hurt'))
song = 'Let it be, let it be, let it be, let it be'
'''Only two occurrences of 'let' are replaced'''
print(song.replace('let', "don't let",　2))

When running the program, the output is:

hurt, hurt heart
Let it be, don't let it be, don't let it be, let it be

More examples of String replace()

song = 'cold, cold heart'
replaced_song = song.replace('o', 'e')
# The original string has not changed
print('The original string:', song)
print('The replaced string:', replaced_song)
song = 'let it be, let it be, let it be'
# Replace up to 0 substrings at most
# Returns a copy of the original string
print(song.replace('let', 'so', 0))

When running the program, the output is:

The original string: cold, cold heart
The replaced string: celd, celd heart
let it be, let it be, let it be

Python string methods