python - 有没有办法读取 .txt 文件并将每一行存储到内存中？

Question

我正在制作一个小程序，它将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。现在我希望 Python 读取每一行并将其存储到内存中，因此当您选择显示数据时，它将在 shell 中显示如下：

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

等等。我怎样才能做到这一点？

Answer 1

我知道它已经回答了:) 总结以上内容：

# 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

它打印在我的控制台上：

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

Answer 2

尝试将其存储在数组中

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

Answer 3

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

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

Answer 4

您可能也对该csv模块感兴趣。它允许您解析、读取和写入逗号分隔值（csv）格式的文件......您的示例似乎在其中。

例子：

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 5

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

Answer 6

#!/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