Python 将文本文件作为列表导入以进行迭代
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Python Import Text FIle as List to Iterate
提问by Ivan Vegner
I have a text file I want to import as a list to use in this for-while loop:
我有一个文本文件，我想将其作为列表导入以在此 for-while 循环中使用：
text_file = open("/Users/abc/test.txt", "r")
list1 = text_file.readlines
list2=[]
for item in list1:
number=0
while number < 5:
list2.append(str(item)+str(number))
number = number + 1
print list2
But when I run this, it outputs:
但是当我运行它时，它输出：
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'builtin_function_or_method' object is not iterable
What do I do?
我该怎么办？
采纳答案by alecxe
readlines()is a method, call it:
readlines()是一个方法，调用它：
list1 = text_file.readlines()
Also, instead of loading the whole file into a python list, iterate over the file object line by line. And use with context manager:
此外，不是将整个文件加载到 python 列表中，而是逐行迭代文件对象。并与上下文管理器一起使用：
with open("/Users/abc/test.txt", "r") as f:
list2 = []
for item in f:
number = 0
while number < 5:
list2.append(item + str(number))
number += 1
print list2
Also note that you don't need to call str()on itemand you can use +=for incrementing the number.
另请注意，您不需要调用str()，item并且可以+=用于增加number.
Also, you can simplify the code even more and use a list comprehensionwith nested loops:
此外，您可以进一步简化代码并使用嵌套循环的列表理解：
with open("/Users/abc/test.txt", "r") as f:
print [item.strip() + str(number)
for item in f
for number in xrange(5)]
Hope that helps.
希望有帮助。
回答by Stefan Gruenwald
List comprehension comes to your help:
列表理解对您有所帮助：
print [y[1]+str(y[0]) for y in list(enumerate([x.strip() for x in open("/Users/abc/test.txt","r")]))]
