Python Basics- Get them Intact
Only two days matter! The day you said ‘hello’ to the world and the day you printed ‘hello world’ in python. But we’re sure you wanted to say more than just a ‘hello’ to the world and wanted to print more than just ‘hello world’.
We taught you how to set up the required python environment in the previous blog, if you haven’t read that, do give it a shot, else, you’ll have tough time setting it up on your own. We highly encourage you to not just read this blog but actually practice whatever we teach you by doing a hands on.
Let’s get our basics done. This part might feel a little boring but trust me this is very important, in fact it is a mandate, can’t skip.
Syntax Note- Python is a case sensitive language. Python takes indentation very seriously, indentation here represents a block of code. You’ll get loads of errors if you ignore the indentation.
Import the libraries The two libraries that we’ll be using would be numpy and pandas, how to use import them?
Variable You would need to store data, loads of it, quite frequently. You’ll be using variables for that.
Assigning Value to a variable Assign by hard coding a=10 flag=true
Input Data How do we input data from the user? Use this syntax input(“Enter data- “)
Conditions You’ll encounter multiple instances throughout your journey where you’ll have to make some decisions, decisions that are based on some conditions. Well, we can do this with python as well.
Syntax- if condition Condition 1’s result elif Condition 2’s result else Default result
Mangoes = 15 Bananas = 20 if Bananas > Mangoes- print(“There are more Bananas than Mangoes“) elif a == b- print(“The no. of bananas and mangoes is equal“) else - print(“There are more Mangoes than Bananas“)
Arrays Heard of lists, call them arrays from now. An Array is basically a list of values referenced under single name.
Syntax for assigning value- arrayName = [value1, value2, value3, …. , valuen] So instead of using firstPlayer = Player1 secondPlayer = Player2 thirdPlayer = Player3 Use player = [Player1, Player2, Player3]
Know length of an array, you can do this by typing len(arrayName) So, len(player) will give 3 as output
Loops You would encounter situations wherein you’ll have to print lot of repetitive stuff like a count from 1 to 100 or print something hundred times. We use loops for that. You can learn more about and types of loops from the official python documentation.
The below code prints counting from 0 to 99 in 4 lines of code. i = 0 while i<100 - print(i) i += 1
What if you had a list say, myList = [“First”, “Second”, “Third”] and you wanted to print all the elements of the list? Loops make this task easier. We use a for loop to demonstrate how this works
for var in myList- print(var)
Output- First Second Third
What if you wanted to print something through a loop but add some conditions at the same time?
myList = [“First”, “Second”, “Third”] for var in myList- if var!=”Second”- print(var)
Output- First Third
You can learn more properties/functions of arrays, loops, conditions at https-//wiki.python.org/moin/BeginnersGuide/NonProgrammers, after all, we at Analytics Bay want to make you self-sufficient to survive in this world of Analytics.
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