closure

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. [Read More]