如何使用python

Question

我有文件包含

"Starting program and 
Starting program 
Loading molecule... 
Initialising variables... 
Starting the calculation - this could take a while! 
Molecule energy = 2432.6 kcal mol-1 
Calculation finished. Bye!" 
import sys 
import re 

search_string = "Starting program" 
txtlength=len(search_string) 
print "txtlength",txtlength 
lines = open("C:\search.txt", "r").readlines() 
for line in lines: 
    if re.search(search_string, line): 
     print line, 

    else : 
     print "Not found" 

我要找的文件中只有2號線，但輸出中，從這個代碼來是1線也顯示要查找一個文件中的確切長度和​​匹配的字符串

Answer 1

你不需要正則表達式的例子告訴你：

with open("C:/search.txt") as inp: 
    for line in inp: 
     if line.strip() == search_string: 
      print line