So far, we have presented a Boolean option for conditional statements, with eachifstatement evaluating to either true or false. In many cases, we will want a program that evaluates more than two possible outcomes. For this, we will use anelse ifstatement, which is written in Python aselif....
It's not uncommon to encounter aNo such file or directoryerror when working with files in Python. To handle this error, you can use atryandexceptblock to catch the error and handle it accordingly. The following code demonstrates how to handle aNo such file or directoryerror in Python: try:...
A suite must include one or more statements. It can’t be empty.To do nothing inside a suite, you can use Python’s special pass statement. This statement consists of only the single keyword pass. While you can use pass in many places in Python, it’s not always useful:...
So, in the Python program filemy_rand_int.pywe would import therandommodule to generate random numbers in this manner: my_rand_int.py importrandom Copy When we import a module, we are making it available to us in our current program as a separate namespace. This means that we will hav...
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Similar to if statements, the while loop in Python can also include an else block. The else block is optional and will be executed once if the condition is (or becomes) false. while False: # this code doesn't loop never_runs() else: # instead, this code runs once runs_once() Copy...
Taking Advantage ofimportStatements When youimport a modulefrom another module, script, or interactive session, what really happens is that Python loads its contents for later access and use. The interesting point is that theimportstatement runs any executable code in the imported module. ...
Q #1) How to declare an array in Python? Answer: There are 2 ways in which you can declare an array either with the array.array() from the built-in array module or with the numpy.array() from numpy module. With array.array(), you just need to import the array module and then de...
This is an ordinary Python class, with nothing Django-specific about it. We’d like to be able to do things like this in our models (we assume thehandattribute on the model is an instance ofHand): example=MyModel.objects.get(pk=1)print(example.hand.north)new_hand=Hand(north,east,sout...
TypeErrorandValueErrorare just two ofthe many built-in exceptionsin Python. There are dozens of exceptions built into Python. We don't have to import anything in order to use these exceptions; they're just built-in. We can define our own custom exception types by inheriting from another exc...