BASIC PYTHON

Nazihah Islam — Sat, 19 Nov 2022 16:43:52 +0000

Arithmetic Operations in Python

Python adds, subtracts, multiplies and divides integers just like general mathematics, where the specific signs are known as operators such as " +, -, , / ".

The new arithmetic operations in python are floor division and modulus.

Floor Division

5//2 gives 2 since the floor value of 2.5 is 2.

MODULUS

The answer to 5%2 is 1 as dividing 5 by 2 gives 1 as the remainder and hence the 8%2 will be 0.

STRING SLICING

The index of lists and strings starts from 0. If we want to get a particular character from a string we can use string slicing as shown above.

Slicing can also be used to print the entire string using steps and it can also be used to reverse a string shown below.

LISTS

Adding elements to a list

USING APPEND:

USING EXTEND

We can change specific elements in list using list indexing.

DICTIONARIES

Dictionaries behave as key values pairs. They hold values through keys.

Dictionaries can hold any data types as items

TUPLES

Tuples are immutable unlike lists. This is the main difference between the two

SETS

Sets are a collection of unique elements.

FOR and WHILE Loops in Python

Loops print elements in a sequence. The difference between for and while loop is that if we do not know how many times the loop will run we use for loops and if the number of loops in fixed we can use while loop:

FUNCTIONS

Built in MAP Function

LAMBDA EXPRESSION

Helps to get rid of defining the entire function.

FILTER

Filters out elements from a sequence.

Filters out the odd numbers from seq in the above case.

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