python - takes exactly 1 positional argument (0 given) -

i'm trying make every time click button can run different.

counter = 0  def b_c(counter):     counter = counter + 1     if counter == 1:         print("1")     elif counter == 2:         print("2")     else:          if counter == 3:              print("3") 

but get

typeerror: b_c() takes 1 positional argument (0 given) 

try this:

counter = 0  def b_c():     global counter     counter += 1     if counter == 1:         print("1")     elif counter == 2:         print("2")     else:          if counter == 3:              print("3")  b_c() b_c() b_c() 

output:

1 2 3 

first thing: python case sensitive, counter not equal counter. , in function can use global counter don't need pass counter button click.