5 Python Built-ins You’re Not Using (But Should Be)

You don’t need a library. You don’t need to pip install anything. These five tools are already sitting inside Python, waiting for you to use them. Most junior developers don’t know they exist. Senior developers reach for them every single day. Let’s fix that. 1. zip() Loop over multiple lists at the same time. How most beginners do it: names = [ ' Alice ' , ' Bob ' , ' Carol ' ] scores = [ 95 , 87 , 92 ] for i in range ( len ( names )): print ( names [ i ], scores [ i ]) How you should do it: for name , score in zip ( names , scores ): print ( name , score ) zip() pairs up elements from two (or more) iterables and lets you loop over them together. It stops when the shortest one runs out. You can also use it to combine lists into a dictionary: name_score = dict ( zip ( names , scores )) # {'Alice': 95, 'Bob': 87, 'Carol': 92} 2. any() and all() Check conditions across a list without writing a loop. The verbose way: scores = [ 85 , 92 , 78 , 95 ] has_pass = False for s in scores : if s >