Python Commit

Author: rishiyadav1923

Arrays.py

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+# Python Arrays
+# *Note: Python does not have built-in support for Arrays, but Python Lists can be used instead.
+
+# Arrays
+# *Note: This page shows you how to use LISTS as ARRAYS, however, to work with arrays in Python you will have to import a library, like the NumPy library.
+
+# Arrays are used to store multiple values in one single variable:
+
+# Example
+# Create an array containing car names:
+
+cars = ["Ford", "Volvo", "BMW"]
+
+# What is an Array?
+# An array is a special variable, which can hold more than one value at a time.
+
+# If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this:
+
+car1 = "Ford"
+car2 = "Volvo"
+car3 = "BMW"
+
+# However, what if you want to loop through the cars and find a specific one? And what if you had not 3 cars, but 300?
+
+# The solution is an array!
+
+# An array can hold many values under a single name, and you can access the values by referring to an index number.
+
+# Access the Elements of an Array
+# You refer to an array element by referring to the index number.
+
+# Example
+# Get the value of the first array item:
+
+x = cars[0]
+# Example
+# Modify the value of the first array item:
+
+cars[0] = "Toyota"
+
+# The Length of an Array
+# Use the len() method to return the length of an array (the number of elements in an array).
+
+# Example
+# Return the number of elements in the cars array:
+
+x = len(cars)
+
+# *Note: The length of an array is always one more than the highest array index.
+
+# Looping Array Elements
+# You can use the for in loop to loop through all the elements of an array.
+
+# Example
+# Print each item in the cars array:
+
+for x in cars:
+  print(x)
+
+# Adding Array Elements
+# You can use the append() method to add an element to an array.
+
+# Example
+# Add one more element to the cars array:
+
+cars.append("Honda")
+
+# Removing Array Elements
+# You can use the pop() method to remove an element from the array.
+
+# Example
+# Delete the second element of the cars array:
+
+cars.pop(1)
+
+# You can also use the remove() method to remove an element from the array.
+
+# Example
+# Delete the element that has the value "Volvo":
+
+cars.remove("Volvo")
+
+# *Note: The list's remove() method only removes the first occurrence of the specified value.
+
+# Array Methods
+# Python has a set of built-in methods that you can use on lists/arrays.
+
+# Method	Description
+
+# append()	Adds an element at the end of the list
+# clear()	Removes all the elements from the list
+# copy()	Returns a copy of the list
+# count()	Returns the number of elements with the specified value
+# extend()	Add the elements of a list (or any iterable), to the end of the current list
+# index()	Returns the index of the first element with the specified value
+# insert()	Adds an element at the specified position
+# pop()	Removes the element at the specified position
+# remove()	Removes the first item with the specified value
+# reverse()	Reverses the order of the list
+# sort()	Sorts the list
+
+# *Note: Methods of Arrays & Lists Are Exactly Same
+# *Note: Python does not have built-in support for Arrays, but Python Lists can be used instead.
+

Basic.py

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+if 5 > 2:
+    print("5 is greater then 2")
+if 5 > 2:
+    print("5 is greater then 2")
+    
+# Variable declaration
+a = 5   # a is of type int
+y = "Hello, world!" # y is of type str
+
+# Casting -> If you want to specify the data type of a variable, this can be done with casting 
+
+x = str(3)   # x will be '3'
+y = int(3)   # y will be 3
+z = float(3) # z will be 3.0
+
+print(a)
+print(y)
+
+# type() -> You can get the data type of a variable with the type() function.
+
+print(type(x))
+print(type(y))
+print(type(z))
+
+q = "Rishi" # Double-Quote
+Q = 'Rishi' # single-Quote
+
+# Also Pythom variables are case Sensitive, Mena one cannot overcome 'q' with 'Q'
+
+# This is a comment
+
+"""
+This is a Multiline comment
+"""