什么是在python中导入文本文件的快速方法？

Question

I have a plain text file with a sequence of numbers, one on each line. I need to import those values into a list. I'm currently learning python and I'm not sure of which is a fast or even "standard" way of doing this (also, I come from R so I'm used to the scan or readLines functions that makes this task a breeze).

The file looks like this (note: this isn't a csv file, commas are decimal points):

204,00
10,00
10,00
10,00
10,00
11,00
70,00
276,00
58,00
...

Since it uses commas instead of '.' for decimal points, I guess the task's a little harder, but it should be more or less the same, right?

This is my current solution, which I find quite cumbersome:

f = open("some_file", "r")
data = f.read().replace('\n', '|')
data = data[0:(len(data) - 2)].replace(',', '.')
data = data.split('|')
x = range(len(data))
for i in range(len(data)):
    x[i] = float(data[i])

Thanks in advance.

Answer 1

UPDATE

I didn't realize the comma was the decimal separator. If the locale is set right, something like this should work

lines = [locale.atof(line.strip()) for line in open(filename)]

if not, you could do

lines = [float(line.strip().replace(',','.')) for line in open(filename)]

---

lines = [line.strip() for line in open(filename)]

if you want the data as numbers ...

lines = [map(float,line.strip().split(',')) for line in open(filename)]

• edited as per first two comments below

Answer 2

bsoist's answer is good if locale is set correctly. If not, you can simply read the entire file in and split on the line breaks ( \\n ), then use a list comprehension for replacements.

with open('some_file.txt', 'r') as datafile:
    data = datafile.read()

x = [float(value.replace(",", ".")) for value in data.split('\n')]

Answer 3

For a more simpler way you could just do

Read = []
with open('File.txt', 'r') as File:
    Read = File.readLines()

for A in Read:
    print A

The "with open()" will open the file and quit when it's finished reading. This is good practice IIRC.

Then the For loop will just loop over Read and print out the lines.