[英]How to use readlines to read from file and return the abbreviation of item
file looks like this: 文件看起来像这样:
BURGER KING
BRG
MCDONALDS
MCDNLDS
WENDYS
WNDY
Example: 例:
food('abbreviations.txt')
Enter a fast food place: McDonalds
Abbreviation: MCDNLDS
Enter a fast food place:
Thank you!
so far: 至今:
infile = open(filename, 'r')
l = infile.readlines()
infile.close()
but I don't know what to do after readlines 但我不知道读完后该怎么办
I shouldn't be doing this, but I found the exercise funny. 我不应该这样做,但是我发现这项运动很有趣。 So here we go:
所以我们开始:
lines = [i.strip() for i in l if i.strip()]
abbrev = dict(zip(lines[0::2], lines[1::2]))
Then abbrev
is a dictionary/mapping where you obtain abbreviatons by looking up whole names as keys. 然后
abbrev
是一个字典/映射,您可以在其中查找全名作为键来获得abbreviatons。
If you want to understand the statement I suggest you try each piece separately in an interactive python shell. 如果您想了解该语句,建议您在交互式python shell中分别尝试每篇。
Here's the interactive session example, with some additional suggestions: 这是交互式会话示例,其中包含一些其他建议:
>>> infile = open("abbreviations.txt", "r")
>>> lines = [l.strip() for l in infile]
>>> lines
['BURGER KING', '', 'BRG', '', 'MCDONALDS', '', 'MCDNLDS', '', 'WENDYS', '', 'WNDY']
>>> lines[0::4]
['BURGER KING', 'MCDONALDS', 'WENDYS']
>>> lines[2::4]
['BRG', 'MCDNLDS', 'WNDY']
>>> zip(lines[0::4], lines[2::4])
[('BURGER KING', 'BRG'), ('MCDONALDS', 'MCDNLDS'), ('WENDYS', 'WNDY')]
>>> abbrev = dict(zip(lines[0::4], lines[2::4]))
>>> abbrev
{'MCDONALDS': 'MCDNLDS', 'WENDYS': 'WNDY', 'BURGER KING': 'BRG'}
>>> abbrev["WENDYS"]
'WNDY'
You could read lines in pairs and make them keys and values, respectively, to add to a dictionary. 您可以成对读取行,并分别使它们成为键和值,以添加到字典中。 Then get user input (in a loop) and look up the entered string in that dict.
然后获取用户输入(循环)并在该字典中查找输入的字符串。
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