[技术讨论] 一行Python代码获取文件最长的行的长度

f = open('a.txt', 'r')
longest = 0
while True:
    linelen = len(f.readline().strip())
    if not linelen:
        break
    if linelen > longest:
        longest = linelen
f.close()
print longest
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f = open('a.txt', 'r')
longest = 0
allLines = f.readlines()
f.close()
for line in allLines:
    linelen = len(line.strip())
    if linelen > longest:
        longest = linelen
print longest
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f = open('a.txt', 'r')
longest = 0
allLines = [x.strip() for x in f.readlines()]
f.close()
for line in allLines:
    linelen = len(line)
    if linelen > longest:
        longest = linelen
print longest
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f = open('a.txt', 'r')
allLineLens = [len(x.strip()) for x in f]
f.close()
print max(allLineLens)
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f = open('a.txt', 'r')
longest = max(len(x.strip()) for x in f)
f.close()
print longest
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print max(len(x.strip()) for x in open('a.txt'))
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