[英]Read next lines of a file to determine whether or not to print current line
我正在嘗試在 python 中編寫這個程序切片器程序,但這一點點讓我永遠想明白。
我想逐行讀取某些文件,並且只打印影響某個變量的行。 在這種情況num
這是我正在讀取的文本文件:
a = 3
b = 4
num = 0
while a > b:
if a > b:
a = a +2
b = b + 1
if a > 2:
num-=1
我的 python 文件必須讀取此文件 ^ 並且它必須通過打印包含變量num
的行和其中num
所在的循環語句來隔離變量num
。 這是我期望的 output:
num = 0
while a > b:
if a > b:
if a > 2:
num-=1
到目前為止,這是我的代碼,負責讀取循環內行的代碼部分不起作用:
# Open file
file = open('text.py', 'r')
Lines = file.readlines()
count = 0
word = "num"
# Store all the loop statements that can appear in the file
keyword = ["while", "for", "if", "else", "elif", "def"]
for i in range(len(Lines)):
count += 1
# if line contains keyword
if any(word in Lines[i] for word in keyword):
# read lines inside the loop
# count_indent is a function that counts the indent of the line to compare it and see if the line is inside the loop or not. I didn't added to the question shorter
line_indent = count_indent(Lines[i])+4
while i <= len(Lines) and count_indent(Lines[i + 1]) == line_indent:
# if word appears in the next lines that are inside the loop then we print the loop statement
if word in Lines[i + 1]:
print(str(count) + " : " + Lines[i])
else:
break
# move to next line inside the loop
i = i + 1
# If line is not empty and contains word
if Lines[i] != '\n' and word in Lines[i]:
print(str(count) + " : " + Lines[i])
此代碼 output 與您的預期相似。
file = open('text.py', 'r', newline = '\n')
lines = file.readlines()
word = "num"
keyword = ["while", "for", "if", "else", "elif", "def"]
with open('out_text.py', 'wt') as fout:
for line in lines:
if any(word in line for word in keyword):
fout.write(line + '\n')
elif word in line:
fout.write(line + '\n')
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