Description

assignee = None
closed_at = <Date 2016-05-14.07:08:56.599>
created_at = <Date 2016-05-14.06:55:39.965>
labels = ['type-bug', 'invalid', 'OS-windows']
title = 'Python3.5.1: type().startswith()'
updated_at = <Date 2016-05-14.07:44:39.784>
user = 'https://bugs.python.org/VertigoRay'

activity = <Date 2016-05-14.07:44:39.784>
actor = 'steven.daprano'
assignee = 'none'
closed = True
closed_date = <Date 2016-05-14.07:08:56.599>
closer = 'SilentGhost'
components = ['Windows']
creation = <Date 2016-05-14.06:55:39.965>
creator = 'VertigoRay'
dependencies = []
files = []
hgrepos = []
issue_num = 27017
keywords = []
message_count = 3.0
messages = ['265505', '265506', '265508']
nosy_count = 7.0
nosy_names = ['paul.moore', 'tim.golden', 'steven.daprano', 'SilentGhost', 'zach.ware', 'steve.dower', 'VertigoRay']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27017'
versions = ['Python 3.5']

Activity

1. VertigoRay commented on May 14, 2016

   

   VertigoRaymannequin

   on May 14, 2016

   MannequinAuthor

   More actions

   This doesn't look like proper functionality

       Python 3.5.1 (v3.5.1:37a07cee5969, Dec  6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32
       Type "help", "copyright", "credits" or "license" for more information.
       >>> type('')
       <class 'str'>
       >>> type('').startswith('s')
       Traceback (most recent call last):
         File "<stdin>", line 1, in <module>
       TypeError: startswith() takes at least 1 argument (0 given)
       >>> type('').startswith('s', 's')
       True
2. VertigoRay

   added

   OS-windows

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on May 14, 2016
3. SilentGhost commented on May 14, 2016

   

   SilentGhostmannequin

   on May 14, 2016

   Mannequin

   More actions

   This is exactly how methods on Python object have been behaving for year: any method can be called either as method on instance, or as method on class, with instance passed as the first argument.
4. SilentGhost

   added

   invalid

   on May 14, 2016
5. SilentGhost

   closed this as completedon May 14, 2016
6. stevendaprano commented on May 14, 2016

   

   stevendaprano

   on May 14, 2016

   Member

   More actions

   To explain in more detail: type('s').startswith is the same as str.startswith, which is an unbound method in Python 2 and a regular function in Python 3. Either way, it expects two arguments: a string which becomes "self", and a second string argument, which is the prefix being tested for.

   So type('any string').startswith('alphabet', 'al') is a long way of writing 'alphabet'.startswith('al').
7. ezio-melotti

   transferred this issue fromon Apr 10, 2022

Issue actions