Consider using f-strings PYL-C0209
Performance
Minor
5 months ago
—
2 years old
Formatting a regular string which could be a f-string
50 QT5 = True
51
52_EMAIL_REGEXP = re.compile(r"[\w+]+@\w+\.\w+")
53_FEEDBACK_URL = "https://sentry.io/api/0/projects/{organization_slug}/{project_slug}/user-feedback/".format( 54 organization_slug="cent", project_slug="partseg"
55)
56Formatting a regular string which could be a f-string
308 defaults_dict[field_name] = default_value
309 elif defaults:
310 raise TypeError(
311 "Non-default namedtuple field {field_name} cannot "312 "follow default field(s) {default_names}".format(
313 field_name=field_name, default_names=", ".join(defaults_dict.keys())
314 )
Description
f-strings are the fastest way to format strings as compared to the following methods:
- using format specifiers
% - using
format() - using
str.join - using
+operator to concatinate string - using
Template.substitute
Bad practice
Some less preferred ways to format strings are the following:
from string import Template
menu = ('eggs', 'spam', 42.4)
old_order = "%s and %s: %.2f ¤" % menu # [consider-using-f-string]
beginner_order = menu[0] + " and " + menu[1] + ": " + str(menu[2]) + " ¤"
joined_order = " and ".join(menu[:2])
format_order = "{} and {}: {:0.2f} ¤".format(menu[0], menu[1], menu[2])
named_format_order = "{eggs} and {spam}: {price:0.2f} ¤".format(eggs=menu[0], spam=menu[1], price=menu[2])
template_order = Template('$eggs and $spam: $price ¤').substitute(eggs=menu[0], spam=menu[1], price=menu[2])
Recommended
Consider using f-strings as shown below:
menu = ('eggs', 'spam', 42.4)
f_string_order = f"{menu[0]} and {menu[1]}: {menu[2]:0.2f} ¤"