SyntaxError non-default argument follows default argument

Question

from os import system def a len1 hgt len1 til col 0       system  mode con cols   len1  lines   hgt      system  title  til      system  color  col   a 64 25  hi   0b   input     When I run this  it rejects  def a      and highlights     in red  I have no clue why

User · Answer

As the error message says  non-default argument til should not follow default argument hgt   Changing order of parameters  function call also be adjusted accordingly  or making hgt non-default parameter will solve your problem   def a len1  hgt len1  til  col 0     -   def a len1  hgt  til  col 0     UPDATE  Another issue that is hidden by the SyntaxError   os system accepts only one string parameter   def a len1  hgt  til  col 0       system  mode con cols  s lines  s     len1  hgt       system  title  s    til      system  color  s    col

User · Answer

You can t have a non-keyword argument after a keyword argument   Make sure you re-arrange your function arguments like so   def a len1 til hgt len1 col 0       system  mode con cols   len1  lines   hgt      system  title  til      system  color  col   a 64  hi  25  0b

User · Answer

Let me clarify two points here    Firstly non-default argument should not follow the default argument  it means you can t define  a    b  c  in function  The correct order of defining parameter in function are   positional parameter or non-default parameter  i e  a b c  keyword parameter or default parameter         i e  a    b  r   j   keyword-only parameter                         i e   args  var-keyword  parameter                         i e    kwargs   def example a  b  c None  r  quot w quot    d      ae     ab    a b  are positional parameter  c none  is optional parameter  r  quot w quot   is keyword parameter  d     is list parameter   ae  is keyword-only   ab  is var-keyword parameter so first re-arrange your parameters  now the second thing is you have to define len1 when you are doing hgt len1 the len1 argument is not defined when default values are saved  Python computes and saves default values when you define the function len1 is not defined  does not exist when this happens  it exists only when the function is executed   so second remove this  quot len1   hgt quot  it s not allowed in python  keep in mind the difference between argument and parameters

[python] SyntaxError: non-default argument follows default argument

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