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Python3.5.1: type().startswith() #71204
Description
| BPO | 27017 |
|---|---|
| Nosy | @pfmoore, @tjguk, @stevendaprano, @zware, @zooba |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
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'bugs.python.org fields:
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
VertigoRay commentedon May 14, 2016
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') TrueSilentGhost commentedon May 14, 2016
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.
stevendaprano commentedon May 14, 2016
To explain in more detail:
type('s').startswithis the same asstr.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').