CODEWITHSUNDEEP
python
J.Hongxia
J.Hongxia

Reputation: 17

Python: TypeError: function takes at least 2 arguments

when I do some exercises in the book --Machine learning in Action, in the dating matching problem, I meet the following problem, but I don't know why!

Traceback (most recent call last):
  File "(stdin)", line 1, in (module)
  File 'kNN.py', line 27 ,in file2matrix
     fr = open(filename)
TypeError: function takes at least 2 arguments (1 given)

Here is my code:

    from numpy import *
    import operator
    from os import *

def file2matrix(filename):
    fr = open(filename)
    arrayOLines = fr.readlines()
    numberOfLines = len(arrayOLines)
    returnMat = zeros((numberOfLines,3))
    classLabelVector = []
    index = 0
    for line in arrayOLines:
        line = line.strip()
        listFromLine = line.split('\t')
        returnMat[index,:] = listFromLine[0:3]
        classLabelVector.append(int(listFromLine[-1]))
        index += 1
    return returnMat,classLabelVector

I made the modification,but the problem still exists! It describe the kNN algorithm.

Upvotes: 0

Views: 2105

Answers (1)

BlackBear
BlackBear

Reputation: 22989

You are overwriting the built-in open function with the one inside os:

In [1]: open?
Docstring:
open(name[, mode[, buffering]]) -> file object

Open a file using the file() type, returns a file object.  This is the
preferred way to open a file.  See file.__doc__ for further information.
Type:      builtin_function_or_method

In [2]: import os

In [3]: os.open?
Docstring:
open(filename, flag [, mode=0777]) -> fd

Open a file (for low level IO).
Type:      builtin_function_or_method

This is why you should avoid from somewhere import *

Upvotes: 3

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