Python - expected string not list

Question

When running the code below, I got the error message saying 'TypeError: expected str, bytes or os.PathLike object, not list'

I used Spyder to debug the above error message - but I could not find the bug. Could someone please tell me how to solve this error? The code is given below

Thank you!

J1 = ['520A','520B']
J2 = ['560S','580A']

JOINTS = J1 + J2

FILES_IN = ['dynres-x-eqk.lst','dynres-y-eqk.lst','dynres-z-eqk.lst'] 
FILE_OUT = ['_Accelerations.txt']

def joint_acc(joint, file_in):
    output = []
    with open(file_in, 'rt') as f_in:
        for line in f_in:
            if 'JOINT ACCELERATIONS' in line:
                for line in f_in:
                    if line.startswith(joint):
                        while line.strip() != '':
                            output.append(line)
                            line = next(f_in)
                        break
    return ''.join(output)

with open(FILE_OUT, 'wt') as f_out:
    for Jt in JOINTS:
        for filename in FILES_IN:
            f_out.write(joint_acc(Jt, filename))
        f_out.write('\n')

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– Ivo Mori, Commented Jul 30, 2020 at 13:14

Daweo · Accepted Answer · 2020-07-30 12:47:13Z

6

You did:

FILE_OUT = ['_Accelerations.txt']

then:

with open(FILE_OUT, 'wt') as f_out:

So this open get list, which cause TypeError. Try replacing FILE_OUT = ['_Accelerations.txt'] with FILE_OUT = '_Accelerations.txt'

answered Jul 30, 2020 at 12:47

Daweo

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Comments

milanbalazs · Accepted Answer · 2020-07-30 12:57:22Z

0

Your FILE_OUT variable is list type but the open waits for str, bytes or os.PathLike object types.

You should convert your FILE_OUT variable to a correct type.

For example to string:

FILE_OUT = "_Accelerations.txt"

Or your can access the first element of your list with 0 index (Your list has only 1 element.)

Like this:

with open(FILE_OUT[0], 'wt') as f_out:

answered Jul 30, 2020 at 12:57

milanbalazs

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