python - Genfromtxt 文件名

Question

我正在尝试读取以字符串形式存储在数据文件中的文件名。那里没问题。如果我将它传递给 genfromtxt，我会收到错误“IOError:Z:\Python\Rb input.txt not found”。如果我明确地将文件名放入 genfromtxt 中，它就可以工作

此操作失败，并出现错误“IOError: Z:\Python\Rb input.txt not found.”

import numpy
modat = open('z:\python\mot1 input.txt') # open file with names in
rbfile = modat.readline()                # read data file name
print rbfile                             # print the file name
rb = numpy.genfromtxt(rbfile, delimiter =',')
print rb

但他的作品

import numpy
modat = open('z:\python\mot1 input.txt') # open file with names in
rbfile = modat.readline()                # read data file name
print rbfile
rb = numpy.genfromtxt('z:\python\Rb input.txt', delimiter =',')
print rb

2 个打印语句给出

%run "c:\users\ian\appdata\local\temp\tmpkiz1n0.py"
Z:\Python\Rb input.txt

[[  2.  10.]
 [  3.  11.]
 [  5.  13.]
 [ 10.  15.]
 [ 15.  16.]
 [ 20.  16.]
 [ 30.  22.]]

这似乎与现在传递字符串有关 - 请提出任何建议

Answer 1

rbfile 末尾有一个行结束符 (EOL)(例如 \r\n)。剥掉它:

rb = numpy.genfromtxt(rbfile.strip(), delimiter =',')

<小时/>

顺便说一句，要调试字符串问题，打印字符串的 repr 通常比打印字符串本身更有用:

print(repr(rbfile))

因为 repr 会更清楚地显示 '\r\n' 等字符。

<小时/>

file.readline()不去除 EOF 字符:

f.readline() reads a single line from the file; a newline character (\n) is left at the end of the string, and is only omitted on the last line of the file if the file doesn’t end in a newline. This makes the return value unambiguous;