Make directory. Write file.

file_write.py

import os

# User entry of folder name.  Make it.
folder = input("Folder name:")
try:
    os.makedirs(folder)
except:
    pass

# User entry of file base.  Build full path.
file_prefix = input("File prefix:")

filename = file_prefix + os.extsep + 'txt'

filepathname = os.path.join(folder, filename)

print(f'Writing to:{filepathname}')

# Write to a file.
with open(filepathname, 'w') as file:
    file.write("Hey, it's working")

# Confirm file has been created.
os.system(f'dir {folder}')