Learn Python with 'de Developer'

deDeveloper

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Welcome To Python!

This is Python Tutorials for beginner to start with

Vairables in Python

Operators in Python

if else statement in Python

User Input in String format

User Input in integer format

Simple Calculator program

Data Types

Type Casting

stringDataTypes = "12"
intDataType = 12
# conversion of string to int
stringDataTypeToIntDataType = int(stringDataType)
print(type(stringDataTypeToIntDataType))
# conversion of int to string
intDataTypeToStringDataType = str(intDataType)
print(type(intDataTypeToStringDataType))
#conversion of int to float
intDataTypeToFloatDataType = float(intDataType)
print(type(intDataTypeToFloatDataType))

Lists in Python

data = ["apple", "mango", "oranges"]
print(data)
# to find length of list in python
print(len(data))
print("List in Python")
myList = [1, 2, 3, 4, 5, 6, 7, 8, 8, 9]
# will display all items in the list
print(myList)
# will display items at some range
print(myList[1:4])
print(myList[4:6])
# also in reverse direction
print(myList[:-1])
print(myList[4:-1])
# to update the value of specific item
myList[2] = 99
print(myList)
# to add new value at the end
myList.append(1002)
print(myList)
# to remove item
print(myList)
myList.remove(8)  # will remove first occurrence of 8
print(myList)
# to sort list
myList.sort()
print(myList)
# to reverse list
myList.reverse()
print(myList)
abc = ["abc", "Hello", "between"]
# to check if something is in the list or not
print(999 in myList)
print(4 in myList)
print(6 in myList)
print(2 in myList)
print("Hello" in abc)

Tuple in Python

print("Tuple in Python")
myTuple = ("grapes", "banana", "apple", "mango") # simple tuple
print(myTuple)  # to display simple tuple
# to display tuple to some range
print(myTuple[1:4])
print(myTuple)
print(myTuple.count("apple"))
print(myTuple.index("apple"))
# searching in tuple
print("banana" in myTuple)
# we can also concatenate tuple
newTuple = ("oranges", "pineapple")
concatenation = myTuple+newTuple
print(concatenation)
# we can also assign dferent variables to diferent values in tuple
#like this one
a, b, c, e = myTuple
print(a)
print(b)
print(c)
print(e)
# and as we can also return multiple values from function we can store them in tuples
# see below
def tupleValues():
    return (1,2,3,4,5,6,7,8,9)
myNewTuple = tupleValues()
print(myNewTuple)
print(type(myNewTuple))

Set in Python

print("Sets in Python")
newSet = {"apple", "mango", "oranges"}
print(type(newSet))
#to add Value to set
newSet.add("grapes")
print(newSet)
# to remove value from set
newSet.remove("apple")
print(newSet)
# to access using loop
for item in newSet:
    print(item)
# to join two sets
newSet1 = {"Banana", "PineApple"}
afterjoin = newSet.union(newSet1)
print(afterjoin)
# if you want to print specific item in set
print("Apple" in afterjoin)
# False due to case

Dectionary in Python

print("Dictionary in Python")
dict = {"apple": 2, "banana": 3, "grapes": 4, "mango": 5}
# type of dict
print(type(dict))
# to print dict keys and values
print(dict)
# return boolean if it exist or not
print("apple" in dict)
# printing specific item
print(dict["apple"])
# length of dict
print(len(dict))
# update
dict.update({"apple": 5})
print(dict)
#add item
dict["color"] = "red";
print(dict)
# remove item
dict.pop("apple")
print(dict)
# REMOVE LAST ITEM
dict.popitem()
print(dict)
# clear method will clear the dictionary
#----dict.clear()
#----print(dict)
# copy dictionary
dict2 = dict.copy()
print(dict2)

Simple Array in Python

While Loop in Python

forin Loop in Python

Functions in Python

Lambda Functions in Python

Simple Authentication using Functions in Python

print("Authentication in python")
def welcome():
    print("Welcome Dude")
def error(index):
    if index < 3:
        authentication()
    else:
        print("Out of Moves")
def authentication():
    indexvalue = 0
    pincode = int(input("Pin COde: "))
    if pincode == 1234:
        welcome()
        # print("incorrect Pin Code")
    else:
        indexvalue = indexvalue + 1
        error(indexvalue)
name = input("Name: ")
authentication()

classes and objects in Python

print("Objects and Classes in Python")
class student:
    def __init__(self, name, age):
        self.name = name
        self.age = age
# now we create new instent of student class
std1 = student("de Developer", 23)
print(std1.age)
print(std1.name)
# Another Example
print("classes and objects in python")
class student:
    def __init__(self, name, age):
        self.name = name
        self.age = age
    def display(self):
        print("Name: " + self.name)
        print("Age: " + str(self.age))
std1 = student("de Developer", 23)
print(std1.display())

inheritance in Python

print("Inheritance in Python")
print("inheritance using python")
class Person:
    def __init__(self, Name, Age):
        self.name = Name
        self.age = Age
    def diplayDataOfUser(self):
        print(self.name)
        print(self.age)
class Student(Person):
    pass
std = Student("De Developer", 22)
std.diplayDataOfUser()
print("inheritance using python")
class Person:
    def __init__(self, Name, Age):
        self.name = Name
        self.age = Age
    def diplayDataOfUser(self):
        print(self.name)
        print(self.age)
class Student(Person):
    def __init__(self, name, age):
        Person.__init__(self, name, age)
        # print(self.name)
        # print(self.age)
std = Student("De Developer", 22)
std.diplayDataOfUser()

Exception Handling in Python

File Handling in Python

print("File Handling in Python")
# opening file if exist
try:
    file = open("data.txt", "r")
except:
    print("file not found: ")
# writing to file and creating
try:
    file1 = open("data.txt", "w")
    file1.write("Hey, this is de Developer \n")
    file1.write("You can follow me on Github \n")
    file1.write("Link to my Github is \n")
    file1.write("[github.com/SyabAhmad] \n")
except:
    print("Some Error")
# reading file
try:
    file3 = open("data.txt", "r")
    a = file3.read()
    print(a)
except:
    print("File Not Found")

Advanced usage

If you want a more complex example (external libraries, viewers...), use the [Advanced Python template]https://github.com/SyabAhmad/Python3DaysChallenge

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