Comment éviter « TypeError : tous les arguments ne sont pas convertis » lors de l'utilisation du formatage d'espace réservé en Python

TypeError When Substituting Placeholder with % Formatting

When attempting to substitute a placeholder like {0} using % formatting, developers may encounter the following error: "TypeError: not all arguments converted during string formatting." This error stems from improper formatting, specifically due to a mix-up between old-style % formatting and new-style {} formatting.

Old-style % formatting employs placeholders like %d for formatting, as exemplified below:

'It will cost $%d dollars.' % 95

However, when utilizing multiple values, they must be provided as a tuple:

"'%s' is longer than '%s'" % (name1, name2)

On the other hand, new-style {} formatting employs placeholders like {} and the .format method. It's crucial to avoid mixing these two styles. If the template string contains {} placeholders, .format should be used, not %.

# Correct:
'It will cost ${0} dollars.'.format(95)
"'{0}' is longer than '{1}'".format(name1, name2)

# Incorrect (Do not mix % and {}):
'It will cost ${0} dollars.' % 95
"'%0' is longer than '%1'" % (name1, name2)

By adhering to these formatting guidelines, developers can resolve the "TypeError: not all arguments converted during string formatting" error and format their strings correctly.

Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!