[英]How to use keys from a dictionary to search for strings?
我正在編寫一個編輯文本文件的程序。 我打算讓程序查找重復的字符串並刪除n-1行相似的字符串。
這是我到目前為止的腳本:
import re
fname = raw_input("File name - ")
fhand = open(fname, "r+")
fhand.read()
counts = {}
pattern = re.compile(pattern)
# This searches the file for duplicate strings and inserts them into a dictionary with a counter
# as the value
for line in fhand:
for match in pattern.findall(line):
counts.setdefault(match, 0)
counts[match] += 1
pvar = {}
#This creates a new dictionary which contains all of the keys in the previous dictionary with
# count > 1
for match, count in counts.items():
if count > 1:
pvar[match] = count
fhand.close()
count = 0
# Here I am trying to delete n - 1 instances of each string that was a key in the previous
# dictionary
with open(fname, 'r+') as fhand:
for line in fhand:
for match, count in pvar.items():
if re.search(match, line) not in line:
continue
count += 1
else:
fhand.write(line)
print count
fhand.close()
如何使最后的代碼起作用? 是否可以使用字典中的鍵來標識相關行並刪除n-1個實例? 還是我做的完全錯誤?
編輯:來自文件的樣本,這應該是一個列表,每個“ XYZ”實例都位於換行符上,並且前面有兩個空格字符。 格式有點混亂,我很抱歉輸入
-=XYZ[0:2] &
-=XYZ[0:2] &
-=XYZ[3:5] &
=XYZ[6:8] &
=XYZ[9:11] &
=XYZ[12:14] &
-=XYZ[15:17] &
=XYZ[18:20] &
=XYZ[21:23] &
輸出值
= XYZ [0:2]
編輯
另外,有人可以解釋為什么代碼的最后部分不返回任何內容嗎?
這是不使用正則表達式,使用字典的內容(因此行是無序的,可能沒關系...):
#!/usr/bin/env python
import os
res = {}
with open("input.txt") as f:
for line in f.readlines():
line = line.strip()
key = line.split('[')[0].replace('-','').replace('=', '')
if key in res:
continue
res[key] = line
# res[key] = line.replace('&', '').strip()
print os.linesep.join(res.values())
這並不能消除尾隨的“&”號。 如果您想擺脫它,請取消注釋:
res[key] = line.replace('&', '').strip()
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