有没有办法读取.txt文件并将每行存储到内存中？

Question

我正在制作一个小程序，用于读取和显示文档中的文本。我有一个看起来像这样的测试文件：

12,12,12 
12,31,12 
1,5,3 
... 

等等。现在我想Python来读取每一行并将其存储到内存中，所以当你选择要显示的数据，将在shell中显示它是这样：

1. 12,12,12 
2. 12,31,12 
... 

等。我怎样才能做到这一点？

Answer 1

我知道已经回答了:)以上概括为：

# It is a good idea to store the filename into a variable. 
# The variable can later become a function argument when the 
# code is converted to a function body. 
filename = 'data.txt' 

# Using the newer with construct to close the file automatically. 
with open(filename) as f: 
    data = f.readlines() 

# Or using the older approach and closing the filea explicitly. 
# Here the data is re-read again, do not use both ;) 
f = open(filename) 
data = f.readlines() 
f.close() 


# The data is of the list type. The Python list type is actually 
# a dynamic array. The lines contain also the \n; hence the .rstrip() 
for n, line in enumerate(data, 1): 
    print '{:2}.'.format(n), line.rstrip() 

print '-----------------' 

# You can later iterate through the list for other purpose, for 
# example to read them via the csv.reader. 
import csv 

reader = csv.reader(data) 
for row in reader: 
    print row 

它打印出我的控制台上：

1. 12,12,12 
2. 12,31,12 
3. 1,5,3 
----------------- 
['12', '12', '12'] 
['12', '31', '12'] 
['1', '5', '3'] 

Answer 2

尝试它存储在数组

f = open("file.txt", "r") 
a = [] 
for line in f: 
    a.append(line) 

Answer 3

您还可能有兴趣在csv模块中。它可以让你解析，读取和写入的逗号分隔值格式文件（CSV）......，你的例子似乎是在

例：

import csv 
reader = csv.reader(open('file.txt', 'rb'), delimiter=',') 
#Iterate over each row 
for idx,row in enumerate(reader): 
    print "%s: %s"%(idx+1,row) 

Answer 4

with open('test.txt') as o: 
    for i,t in enumerate(o.readlines(), 1): 
     print ("%s. %s"% (i, t)) 

Answer 5

#!/usr/local/bin/python 

t=1 

with open('sample.txt') as inf: 
    for line in inf: 
     num = line.strip() # contains current line 
     if num: 
      fn = '%d.txt' %t # gives the name to files t= 1.txt,2.txt,3.txt ..... 
      print('%d.txt Files splitted' %t) 
      #fn = '%s.txt' %num 
      with open(fn, 'w') as outf: 
       outf.write('%s\n' %num) # writes current line in opened fn file 
       t=t+1 

Answer 6

感谢@PePr优秀的解决方案。另外，您可以尝试使用内置方法String.join(data)打印.txt文件。例如：

with open(filename) as f: 
    data = f.readlines() 
print(''.join(data))