如何在文件中查找特定字符串？

Question

这是一个脚本，我已经写了找到所有与usb线在它。然而，问题是，如果它们也有像usbcore这样的单词，if也会返回行。我对只包含usb字样的行感兴趣

#!/usr/bin/python

import sys

logFile = open(sys.argv[1])

print("Printing all lines with USB in it...")

for line in logFile.readlines():
    if line.lower().find('usb') != -1:
        print(line)

print('Done!')

Answer 1

这是一条单行线：

with open(sys.arg[1]) as f: 
    print(''.join([l for l in f.readlines() if ' ubs ' in l.lower()])

Answer 2

您可以尝试查找带有空格的单词' usb '：

import sys

logFile = open(sys.argv[1])

print("Printing all lines with USB in it...")

for line in logFile.readlines():
    if line.lower().find(' usb ') != -1:
        print(line)

print('Done!')

• 例如：

  a = ' i have usbbox '
  b = ' i have usb '
  a.find('usb') # != -1
  a.find(' usb ') # = -1 , bcs it doesnt contain the word 'usb' only
  b.find(' usb ') # != -1 , it contains it