[Python] Python IndexError at index[0] with positional arguments [closed]

I'm trying to run a self-made program called add-entry.py which is taking 3 positional arguments. I understand that sys.argv[0] is the name of the program itself, when I intentionally call it without any other argument passed, I receive this error message

filename = sys.argv[1]

IndexError: list index out of range


Which is true, but my code is taking care of that, see below:

import sys
import os

# check the number of arguments

args = sys.argv[1:]

if not args or len(args) < 3:
print("Usage: python add-entry.py <filename> <text...>")

basedir = os.getcwd()

filename = sys.argv[1]
text_to_add = sys.argv[2:]

fullpath = os.path.join(basedir, filename)


On the opposite, when I provide the filename but not the text, it's handled by my code.

What is happening there, how can I correct it ?

Thanks

Full code:

import sys
import os

# check the number of arguments

args = sys.argv[1:]

if not args or len(args) < 3:
print("Usage: python add-entry.py <filename> <text...>")

basedir = os.getcwd()

filename = sys.argv[1]
text_to_add = sys.argv[2:]

fullpath = os.path.join(basedir, filename)


# split text arguments provided
def split_text_args():
return [arg.strip() for arg in text_to_add]

# split text from file
def split_text_file():
with open(fullpath) as file:
return [line.strip() for line in file]

text_args = split_text_args()
text_file = split_text_file()

# check if text to add already exists in file, if not, append it and terminate the function

for text in text_args:
if text in text_file:
print(f"'{text}' already exists.")
else:
with open(fullpath, 'a') as file:
file.write(text + '\n')
print(f"'{text}' successfully added to '{filename}'.")
sorted(file)
exit(0)

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