Brief Tour of the Standard Library — Part II example problem

[YasirA]

BPO	36413
Nosy	@rhettinger

^{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 = 'https://github.com/rhettinger'
closed_at = <Date 2019-03-24.05:51:39.401>
created_at = <Date 2019-03-24.05:06:03.377>
labels = ['3.7', 'invalid', 'docs']
title = 'Brief Tour of the Standard Library \xe2\x80\x94 Part II example problem'
updated_at = <Date 2019-03-24.05:51:39.400>
user = 'https://bugs.python.org/YasirA'

bugs.python.org fields:

activity = <Date 2019-03-24.05:51:39.400>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2019-03-24.05:51:39.401>
closer = 'rhettinger'
components = ['Documentation']
creation = <Date 2019-03-24.05:06:03.377>
creator = 'YasirA'
dependencies = []
files = []
hgrepos = []
issue_num = 36413
keywords = []
message_count = 2.0
messages = ['338714', '338718']
nosy_count = 3.0
nosy_names = ['rhettinger', 'docs@python', 'YasirA']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36413'
versions = ['Python 3.7']

[YasirA]

In the Template example, there's no placeholder to be substituted with date. I think it should be rewritten along the following lines:

    >>> import time, os.path
    >>> photofiles = ['img_1074.jpg', 'img_1076.jpg', 'img_1077.jpg']
    >>> class BatchRename(Template):
    ...     delimiter = '%'
    >>> fmt = input('Enter rename style (%d-date %n-seqnum %f-format):  ')
    Enter rename style (%d-date %n-seqnum %f-format):  Ashley_%d%n%f

    >>> t = BatchRename(fmt)
    >>> date = time.strftime('%d%b%y')
    >>> for i, filename in enumerate(photofiles):
    ...     base, ext = os.path.splitext(filename)
    ...     newname = t.substitute(d=date+'_', n=i, f=ext)
    ...     print('{0} --> {1}'.format(filename, newname))

img_1074.jpg --> Ashley_0.jpg
img_1076.jpg --> Ashley_1.jpg
img_1077.jpg --> Ashley_2.jpg

Yasir.

[rhettinger]

Thank you for the suggestion, but the point of having the input() is that the end user can select their own rename style with arbitrary text and either including or excluding possible data substitutions of their own choice.

The photo processing software I was using at the time I wrote the example works just like this.