from selenium import webdriver def f(): webdriver = webdriver.Chrome() return webdriver PyCharm gives an error, Unresolved reference webdriver ( import is gray) If you remove the f function, everything will work fine.
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x = creates a local variable x inside the function (in the absence of global x , nonlocal x declarations). From the definition of language :
It is a local variable.
Therefore, the f() call in your case leads to UnboundLocalError , as the webdriver is a local variable and you try to access it before it is assigned a value. The presence of a global variable with the same name does not matter. In any place of the function x this is a local variable due to the presence of x = inside. See the Python FAQ: Why am I getting an UnboundLocalError when the variable has a value?
To fix the code, just rename the webdriver inside the function (driver, browser are good name candidates):
browser = webdriver.Chrome() 
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