Python globálne premenné
Príklady kódu
globálna premenná prístupu Pythonu
globvar = 0
def set_globvar_to_one():
global globvar # Needed to modify global copy of globvar
globvar = 1
def print_globvar():
print(globvar) # No need for global declaration to read value of globvar
set_globvar_to_one()
print_globvar() # Prints 1globálna premenná nefunguje python
trying to assign a global variable in a function will result in the function creating a new variable
with that name even if theres a global one. ensure to declare a as global in the function before any
assignment.
a = 7
def setA(value):
global a # declare a to be a global
a = value # this sets the global value of aglobálna premenná python
#it is best not to use global variables in a function
#(pass it as an argument)
a = 'This is global a'
def yourFunction():
global a
return a[0:2]globálny python
"""
USING GLOBALS ARE A BAD IDEA, THE BEST WAY TO PERFORM AN ACTION WHICH NEEDS GLOBALS WOULD
BE TO USE RETURN STATEMENTS. GLOBALS SHOULD ONLY EVER BE USED IN RARE OCCASIONS WHEN YOU
NEED THEM
"""
# allows you to modify a variable outside its class or function
EXAMPLE:
def test_function():
global x
x = 10
test_function()
print(f"x is equal to {x}") # returns x is equal to 10
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