Which are valid variable names?
A variable name cannot start with a number and cannot have spaces in its name. A variable name must contain only letters, digits or underscores and should start with a letter or underscore
From naming conventions perspective, which variable name would you choose to hold the value of total number of students in a class?
From recommended naming conventions perspective a variable name should start with a small case and every word should be separated by underscore. Although camel casing is used as a norm in OOP, in data analytics you see words separated by underscore. Use noun forms of the word and not verbs for variables
Variable names are case sensitive in Python
Yes. Mean != mean When used they will treated as two separate variables
Choose all the ways you can represent a String value
name = 'joe'
name = "joe"
name = '''joe'''
name = """joe"""
name = joe
Although the first four are valid, three single or double quotes are mostly used for documentation which you will learn later
A programmer named a variable 'lambda'. Is this possible?
lambda is one of keywords and cannot be used as a variable name
A Cloud Computer is actually in the cloud above
HaHa no! A cloud computer is kept in huge data centers of cloud providers where you find thousands of such computers. Popular cloud vendors are Google, Amazon, Microsoft
You have declared a variable `a = 10` and want to know the type assigned. You would use which statement to find that
A data type assigned to a variable will change when a literal value of a different data type is reassigned to it
Yes, for e.g., if age = 10 is reassigned as age = '10 years' then the datatype of 'age' changes from 'int' to 'str'
You are making a lot of changes to different code cells of your Jupyter notebook and all of sudden you see results which do not make any logical sense. What would you do?
Restart the runtime as you think the many changes that you made are still held in memory and are messing you up
Delete code cells and reinsert them
Remember when ever a code cell is run, it will hold all the variables declared in that code block in memory. Even if you remove the variables or delete a code block on your .ipynb file, the variables are still held in memory which are not shown in the code and may be potentially messing you up. Once you restart your runtime, memory will be wiped clean and you start with a clean slate. Deleting a code block and reinserting does not help when you are in this situation