askopenfilename is missing from the Tkinter filedialog library in 2.7.17

[rdnielsen]

BPO	39370
Nosy	@ned-deily

^{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 2020-01-17.19:10:34.339>
created_at = <Date 2020-01-17.14:47:07.552>
labels = ['invalid', 'expert-tkinter']
title = 'askopenfilename is missing from the Tkinter filedialog library in 2.7.17'
updated_at = <Date 2020-01-17.19:10:34.333>
user = 'https://bugs.python.org/rdnielsen'

bugs.python.org fields:

activity = <Date 2020-01-17.19:10:34.333>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-17.19:10:34.339>
closer = 'ned.deily'
components = ['Tkinter']
creation = <Date 2020-01-17.14:47:07.552>
creator = 'rdnielsen'
dependencies = []
files = []
hgrepos = []
issue_num = 39370
keywords = []
message_count = 2.0
messages = ['360194', '360208']
nosy_count = 2.0
nosy_names = ['ned.deily', 'rdnielsen']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39370'
versions = ['Python 2.7']

[rdnielsen]

In Python 2.7.17 on Linux, the code:

    import tkinter.filedialog as tkfiledialog
    dir(tkfiledialog.askopenfilename)

results in:

AttributeError: 'module' object has no attribute 'askopenfilename'

Any attempt to use 'askopenfilename' has the same result, of course.

[ned-deily]

In Python 2, askopenfilename was in the separate tkFileDialog module:

>>> import tkFileDialog
>>> dir(tkFileDialog.askopenfilename)
['__call__',  ...

https://docs.python.org/2/library/tkinter.html?highlight=tkfiledialog#tkinter-modules

"Other modules that provide Tk support include:
[...]
tkFileDialog
Common dialogs to allow the user to specify a file to open or save.
[...]
These have been renamed as well in Python 3; they were all made submodules of the new tkinter package."