a = 13 print('sssss') def Are AAAA (): to the print ( , ' CCC ,' ) def bbbb(): pass # Globals () can view the dictionary of global variables Print (Globals ()) # By calling the function key globals aaaa to go globals () [ ' aaaa ' ] () ''' In fact, built-in function calls and global variables, are the keys to traverse through globals go looking for, First find common key-value pairs can not find again '__builtins__' in looking to see whether the built-in function, if not find, it will error '' ' # View All built-in functions Print (Globals () [ ' the __builtins__ ' ]. The __dict__ ) # Call the print function Globals () [ ' the __builtins__ ' ]. The __dict__ [ ' print ' ] ( ' hahah ' )