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[英]How to delete one line before a specific word in a text file in python
[英]How to delete one line after the specific word with Python
我有一個文本文件( input.txt
),它包含:
COMPDAT
First line 123 456
Second line 4d5 fdf
COMPDAT
Computer 459
Computer 999
COMPDAT
Mouse qwerty
main 478
現在,我需要刪除input.txt
文件中每個COMPDAT
關鍵字之后的第一行。
如何使用Python做到這一點?
我嘗試使用此腳本,但是,它在每個現有行之間添加了一個空行:
import fileinput
fin = fileinput.input('input.txt', inplace=1)
for line in fin:
print (line),
if line.strip() == 'COMPDAT':
next(fin, None)
import fileinput
fin = fileinput.input('input.txt', inplace=True)
for line in fin:
print(line,end='')
if line.strip() == 'COMPDAT':
next(fin, None)
首先讀取文件,獲取所需的所有行,然后將這些行寫入同一文件中。
input_file = open("input.txt", 'r')
prev_line = False
lines =[]
for line in input_file:
if not prev_line:
lines.append(line)
prev_line=False
if "COMPDAT" in line:
prev_line=True
input_file.close()
input_file = open("input.txt", 'w')
for line in lines:
input_file.write(line)
input_file.close()
基於@Sanjay的答案,使用生成器的另一種可能性。
def line_and_line_before(file):
prev_line = None
for line in file:
yield (prev_line, line)
prev_line = line
input_file = open("input.txt", 'r')
lines = []
for prev_line, line in line_and_line_before(input_file):
if not prev_line or "COMPDAT" not in prev_line:
lines.append(line)
input_file.close()
input_file = open("input.txt", 'w')
for line in lines:
input_file.write(line)
input_file.close()
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