Python’s global keyword allows to modify the variable which is out of current scope. In [13]: bar = 1 In [14]: def foo(): ....: global bar ....: bar = 2 ....: In [15]: bar Out[15]: 1 In [16]: foo() In [17]: bar Out[17]: 2 In the above example, bar was declared before foo function. global bar refers to the bar variablewhich is outside the foo scope. After foo invocation bar value was modified inside foo. The value ismodified globally.
