逐行讀取文件中的行到一個數組中的元素在Python

Question

所以在Ruby中我可以做到以下幾點：

testsite_array = Array.new 
y=0 
File.open('topsites.txt').each do |line| 
testsite_array[y] = line 
y=y+1 
end 

如何將一個做到這一點在Python？

Answer 1

testsite_array = [] 
with open('topsites.txt') as my_file: 
    for line in my_file: 
     testsite_array.append(line) 

這是可能的，因爲Python允許您直接遍歷文件。

或者，更簡單的方法，使用f.readlines()：

with open('topsites.txt') as my_file: 
    testsite_array = my_file.readlines() 

Answer 2

只要打開該文件，並使用readlines()功能：

with open('topsites.txt') as file: 
    array = file.readlines() 

Answer 3

在蟒可以使用文件對象的readlines方法。

with open('topsites.txt') as f: 
    testsite_array=f.readlines() 

或者乾脆用list，這是一樣的使用readlines但唯一不同的是，我們可以通過一個可選的大小參數readlines：

with open('topsites.txt') as f: 
    testsite_array=list(f) 

幫助上file.readlines：

In [46]: file.readlines? 
Type:  method_descriptor 
String Form:<method 'readlines' of 'file' objects> 
Namespace: Python builtin 
Docstring: 
readlines([size]) -> list of strings, each a line from the file. 

Call readline() repeatedly and return a list of the lines so read. 
The optional size argument, if given, is an approximate bound on the 
total number of bytes in the lines returned.