I wrote a function to open a txt file and returns me three numpy array. However, I get this error all the time, which I do not have any idea why?

TypeError: load_data_from_file() missing 1 required positional argument: 'filename'

here is my code:

def load_data_from_file(self, filename):
# logging.info("Entered load_data_from_file")
with open(filename, 'r') as data_file:
    wavelengths = []
    spectra = []
    delays = []
    for num, line in enumerate(data_file):
        if num == 0:
            # Get the 1st line, drop the 1st element, and convert it
            # to a float array.
            delays = array([float(stri) for stri in line.split()[1:]])
        else:
            data = [float(stri) for stri in line.split()]
            # The first column contains wavelengths.
            wavelengths.append(data[0])
            # All other columns contain intensity at that wavelength
            # vs time.
            spectra.append(array(data[1:]))
logging.info("Data loaded from file has sizes (%dx%d)" % (delays.size, len(wavelengths)))
return delays, array(wavelengths), vstack(spectra).Tenter code here

I appriciate any comments on this.

CodePudding user response：

The error you are referring is when you call the function load_data_from_file().It seems that you are not passing the filename correctly in the parameters. The correct way to call it should be something like:

output= load_data_from_file(myfile.txt)

Also, I'm not sure, but if you are passing parameter "self" should indicate that you are using class? Please upload your full code here so we can have a better understanding of the issue.

CodePudding user response：

According to the question comments, the problem seems to be that this is actually a class method (a function defined inside a class). Because of this, you have to use your function as a method of a class instance:

my_instance = YourClass(...)
my_instance.load_data_from_file(filename)

This way, your self and filename arguments are correctly used.