entityMap|blocks|key|4sv9l|text|从这个开始：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|bu5iv|In+[546]:+array+=+['foo',+'bar',+'baz',+'foobar']|code-block|syntax|javascript|3eqr7|使用max查找最大字符串的长度|offset|length|style|CODE|4psvh|In+[547]:+max(array,+key=len)+#+ignore+this+line+(it's+for+demonstrative+purposes)
Out[547]:+'foobar'

In+[548]:+maxlen+=+len(max(array,+key=len))|d01g7|现在，使用列表理解并向左填充：|52gm9|In+[551]:+[('+'+*+(maxlen+-+len(x)))+%2B+x+for+x+in+array]
Out[551]:+['+++foo',+'+++bar',+'+++baz',+'foobar']|8mqu4^0|0|0|2|3|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|U|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|V|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|W|9|@$J|X|K|Y|L|M]]|A|@]|B|$]]|$2|N|4|O|6|E|8|Z|9|@]|A|@]|B|$F|G]]|$2|P|4|Q|6|7|8|10|9|@]|A|@]|B|$]]|$2|R|4|S|6|E|8|11|9|@]|A|@]|B|$F|G]]|$2|T|4|-4|6|7|8|12|9|@]|A|@]|B|$]]]]

Starting with this:

<pre><code>In [546]: array = ['foo', 'bar', 'baz', 'foobar']
</code></pre>

Find the length of the largest string using <code>max</code>:

<pre><code>In [547]: max(array, key=len) # ignore this line (it's for demonstrative purposes)
Out[547]: 'foobar'

In [548]: maxlen = len(max(array, key=len))
</code></pre>

Now, use a list comprehension and pad left:

<pre><code>In [551]: [(' ' * (maxlen - len(x))) + x for x in array]
Out[551]: [' foo', ' bar', ' baz', 'foobar']
</code></pre>

entityMap|blocks|key|1nirc|text|1)查找max+len：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|doptl|max_len+=+max(len(el)+for+el+in+lines)|code-block|syntax|javascript|1cmkk|2)在其他字符串的末尾添加空格：|261tn|lines+=+["+"*(max_len+-+len(el))+%2B+el+for+el+in+lines]|54jqq^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|M|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|N|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|O|9|@]|A|@]|B|$]]|$2|J|4|K|6|E|8|P|9|@]|A|@]|B|$F|G]]|$2|L|4|-4|6|7|8|Q|9|@]|A|@]|B|$]]]]

1) find max len:

<pre><code>max_len = max(len(el) for el in lines)
</code></pre>

2) add spaces to the ends of others strings:

<pre><code>lines = [" "*(max_len - len(el)) + el for el in lines]
</code></pre>

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://docs.python.org/3/library/stdtypes.html#str.rjust|blocks|key|30dch|text|假设已经从文件中读取了字符串列表，可以使用str.rjust()填充左侧的字符串：|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|d34s1|>>>+lines+=+['cat',+'dog',+'elephant',+'horse']
>>>+maxlen+=+len(max(lines,+key=len))
>>>+
>>>+[line.rjust(maxlen)+for+line+in+lines]
['+++++cat',+'+++++dog',+'elephant',+'+++horse']|code-block|syntax|javascript|fpcte|您还可以更改填充中使用的字符：|2gq9i|>>>+[line.rjust(maxlen,+'0')+for+line+in+lines]
['00000cat',+'00000dog',+'elephant',+'000horse']
>>>+|scqg^0|L|B|L|B|0|0|0|0|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|W|G|@$H|X|I|Y|J|K]]|L|@$H|Z|I|10|A|11]]|6|$]]|$A|M|C|N|2|O|F|12|G|@]|L|@]|6|$P|Q]]|$A|R|C|S|2|E|F|13|G|@]|L|@]|6|$]]|$A|T|C|U|2|O|F|14|G|@]|L|@]|6|$P|Q]]|$A|V|C|-4|2|E|F|15|G|@]|L|@]|6|$]]]]

Assuming you have your list of strings already read from the file, you can use <a href="https://docs.python.org/3/library/stdtypes.html#str.rjust" rel="noreferrer"><code>str.rjust()</code></a> to pad your strings left:

<pre><code>&gt;&gt;&gt; lines = ['cat', 'dog', 'elephant', 'horse']
&gt;&gt;&gt; maxlen = len(max(lines, key=len))
&gt;&gt;&gt; 
&gt;&gt;&gt; [line.rjust(maxlen) for line in lines]
[' cat', ' dog', 'elephant', ' horse']
</code></pre>

You can also change the character used in the padding:

<pre><code>&gt;&gt;&gt; [line.rjust(maxlen, '0') for line in lines]
['00000cat', '00000dog', 'elephant', '000horse']
&gt;&gt;&gt; 
</code></pre>

entityMap|blocks|key|f04gr|text|你把文件读了两遍。第一次，数据从未被使用过。您可以使用max查找最大值和格式，以添加空格：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|duq7g|with+open('cars')+as+f:
++++lines+=+[line.rstrip('\n')+for+line+in+f]
width+=+max(map(len,+lines))
lines+=+["{0:>{1}s}".format(line,+width)+for+line+in+lines]|code-block|syntax|javascript|73du3^0|R|3|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|M|9|@$A|N|B|O|C|D]]|E|@]|F|$]]|$2|G|4|H|6|I|8|P|9|@]|E|@]|F|$J|K]]|$2|L|4|-4|6|7|8|Q|9|@]|E|@]|F|$]]]]

Your reading the file two times. The first time, the data is never used. You can use <code>max</code> to find the maximum, and format, to add the spaces:

<pre><code>with open('cars') as f:
 lines = [line.rstrip('\n') for line in f]
width = max(map(len, lines))
lines = ["{0:&gt;{1}s}".format(line, width) for line in lines]
</code></pre>

entityMap|blocks|key|4iq4j|text|感谢所有的回复，我这样编辑我的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3jp31|with+open('cars')+as+f:
++++lines+=+f.readlines()
lines+=+[line.rstrip('\n')+for+line+in+open('cars')]
max_line_len+=+len(max(lines,+key=len))
new_lines+=+[line.ljust(max_line_len)+for+line+in+lines]|code-block|syntax|javascript|64ied^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

With Thanks from all answers I edit my code as this:

<pre><code>with open('cars') as f:
 lines = f.readlines()
lines = [line.rstrip('\n') for line in open('cars')]
max_line_len = len(max(lines, key=len))
new_lines = [line.ljust(max_line_len) for line in lines]
</code></pre>

I have a list of strings that read from file. Each element is a line of file.
I want to have an array of this string that have same length. I want to find the longest string and reformat other strings as long as longest string (with space at the end of them).
Now I find the longest one. but I don't know how can I reformat other strings. Can anybody help me please?

<pre><code>with open('cars') as f:
 lines = f.readlines()
lines = [line.rstrip('\n') for line in open('cars')]
max_in=len(lines[0])
for l in lines:
 print (str(len(l))+" "+str(max_in))
 if max_in &lt; len(l):
 max_in=len(l)
print max_in
</code></pre>

Pad strings to be the same length in a list

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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 我有一个从文件读取的字符串列表。每个元素都是一行文件。我想要一个长度相同的字符串数组。我希望找到最长的字符串，并将其他字符串重新格式化为与最长字符串一样长的字符串(在它们的末尾加上空格)。现在我找到了最长的一个。但我不知道如何重新格式化其他字符串。有谁能帮帮我吗？ with open('cars') as f:   ...

问在列表中填充相同长度的字符串
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