在多文字档中搜寻关键字

• 第一层for回圈使用了os.walk()递回取得路径下的所有档案
• 第二层for回圈依序处理.txt、.py、.c三中副档名的档案
• fnmatch.filter()过滤符合副档名的档案

import os, fnmatch

path = "./text"
keyword = "for"

for root, dirs, files in os.walk(path):
	for ext in ['txt', 'py', 'c']:
		for fname in fnmatch.filter(files, '*.' + ext):
			file = os.path.join(path, fname)
			with open(file, "r") as fp:
				num = 1
				for line in fp.readlines():
					if keyword in line:
						print("档案： ", fname)
						print(num, ":", str(line))
					num = num + 1

改用正规表达是搜寻关键字if和for

import os, fnmatch

path = "./text"
pattern = re.compile(‘for’ |’if’)

for root, dirs, files in os.walk(path):
	for ext in ['txt', 'py', 'c']:
		for fname in fnmatch.filter(files, '*.' + ext):
			file = os.path.join(path, fname)
			with open(file, "r") as fp:
				num = 1
				for line in fp.readlines():
					if re.search(pattern, line):
						print("档案： ", fname)
						print(num, ":", str(line))
					num = num + 1