[英]readlines from iterating through an array and writelines to a new file
bad_list is an array that is returned from a different function, returns the line numbers of rows that are problematic and need to be looked at more closely bad_list 是一个从不同函数返回的数组,返回有问题需要更仔细查看的行的行号
eg array([ 1, 3, 4, 27, 50, 99], dtype=int64)
例如array([ 1, 3, 4, 27, 50, 99], dtype=int64)
The idea is to read test.txt, and make a new test_badlines.txt which only contains the problematic lines as specified in bad_list这个想法是读取 test.txt,并创建一个新的 test_badlines.txt,其中只包含 bad_list 中指定的有问题的行
Here is what I have so far, the print line works but the writelines only spits out 1 line when it should be 6 lines这是我到目前为止所拥有的,打印行有效,但写行只在应该是 6 行时吐出 1 行
for rows in bad_list:
filename = 'C:\\Users\\Username\\Downloads\\test.txt'
bad_filename = str(filename)[:-4] + '_badlines.txt'
with open(filename) as f, open(bad_filename, 'w') as wt:
lines = f.readlines()
#print lines[rows]
wt.writelines(lines[rows])
lines
is a plain list
, and plain list
s can't be indexed by a sequence of indices to look up. lines
是一个普通的list
,并且普通的list
不能通过要查找的索引序列进行索引。 The simplest solution here is to make a generator expression that pulls out the lines you're concerned with, replacing:这里最简单的解决方案是制作一个生成器表达式来提取您关心的行,替换:
wt.writelines(lines[rows])
with:和:
wt.writelines(lines[row] for row in bad_list)
Assuming bad_list
is the array you described, you drop the outer for
loop entirely;假设bad_list
是您所描述的数组,则完全删除外部for
循环; you don't want to open the input and output files over and over once per row, just once total.您不想每行一遍又一遍地打开输入和输出文件,总共只打开一次。
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