Added OOPs and Functions

Author: Ashish0741

DAY_19/Exception_Handling_15_06_23.py

@@ -0,0 +1,96 @@
+
+# Decorators : It is nothing but one function
+
+# stage 1: take agrument in form of function reference
+# stage 2: having inner function
+# stage 3: return inner function reference
+
+# ===========================================================================================
+
+print(40 * '=')
+
+# Program 1 : 
+
+def deco_func(take_func_ref):   # stage 1: take agrument in form of function reference
+    def inner_func():           # stage 2: having inner function
+        print("This is inner function of decorator")
+        take_func_ref()         # stage 3: calling function reference
+    
+    return inner_func           # stage 4: return inner function reference
+
+def func():
+    print("This is normal function")
+
+func = deco_func(func)
+func()
+
+
+# ===========================================================================================
+
+print(40 * '=')
+
+# Program 2 : 
+
+def deco_func(take_func_ref):  
+    def inner_func():     
+        print("This is inner function of decorator")   
+        take_func_ref()
+    
+    return inner_func
+
+@deco_func    # other way to call decorator
+def func():
+    print("This is normal function")
+
+
+func()
+
+
+# ===========================================================================================
+
+print(40 * '=')
+
+# Program 3 : 
+
+def swap(divde_ref):
+    def inner(*args, **kwargs):
+        # print(args,kwargs)
+        num1 = args[0]
+        num2 = args[1]
+        if num2 > num1:
+            num1,num2 = num2,num1
+
+        divde_ref(num1, num2)
+
+    return inner
+
+@swap
+def divide(num1,num2):
+    print(num1 // num2)
+
+divide(2,10)
+
+
+# ===========================================================================================
+
+print(40 * '=')
+
+# Program 4: 
+
+def repeat(n):
+    def decorator(func):
+        def wrapper(*args, **kwargs):
+            for _ in range(n):
+                result = func(*args, **kwargs)
+            return result
+        return wrapper
+    return decorator
+
+@repeat(3)
+def greet(name):
+    print(f"Hello, {name}!")
+
+greet("Bob")
+
+
+# ===============================================================================================

DAY_20/Decorator.py

@@ -0,0 +1,100 @@
+
+# File Handling :
+
+# file --> data (.txt,.mp4,etc)
+
+# handling --> operations (read, write and update)
+
+# f1 = open("file1.txt","w")
+# f1.write("This is first program of file handling")  # --> string
+
+# This is continue from last write function output
+# f1.writelines(["This is another method of writing in file\n","Please check"])   # string inside list object
+
+# f1 = open("file1.txt","a")
+# f1.writelines(["This is append operation\n","This will write on next line"])
+# f1.write("Ashish")
+
+# Manual way to read file using loop :
+# f1 = open("file1.txt","r")
+
+# for data in f1:
+#     print(data)
+
+# print(f1.read())  # This will not print unwanted extra lines
+
+# print(f1.readline(1))  # this will return one character
+
+# print(f1.readlines(0))  # this will return one line in form of list
+
+
+# tell() and seek() :
+
+# print(f1.tell())   # this will return current location of file pointer
+# print(f1.readline())
+# print(f1.readline())
+# print(f1.readline())
+# print(f1.readline())
+# print(f1.readline())
+# print(f1.tell())
+# print(f1.seek(7)) # this will shift pointer location to given number
+# print(f1.readline())
+# print(f1.readline())
+# print(f1.tell())
+
+# f1.close()   # always close file to avoid differnt output and errors (this can be done in finally block of exception)
+
+# with block : This will close file automatically
+
+# with open("file1.txt","r") as f1:
+#     print(f1.read())
+
+# we can copy any file easily
+
+# with open("file1.txt",'r') as f1, open("file2.txt","w") as f2:
+#     f2.write(f1.read())
+
+# Serialization and Deserialization :
+
+# In file handling by default only string is allowed for read and write operation
+# 
+# Serialization => object --> btye
+# Deserialization => byte --> object
+
+import pickle
+
+# load(read) , dump(write)
+
+li1 = ["Ashish",23]
+
+# "wb" and "rb"  -> for byte mode
+
+# f1 = open("file1.txt",'wb')
+# # f1.write(li1)   # TypeError: a bytes-like object is required, not 'list'
+
+# pickle.dump(li1,f1)
+# f1.close()
+
+# f1 = open("file1.txt","rb")
+# print(pickle.load(f1))
+
+class Person:
+    def __init__(self,name,age) -> None:
+        self.name = name
+        self.age = age
+
+    def __str__(self) -> str:
+        return f"{self.name} {self.age}"
+
+p1 = Person("Ashish",23)
+
+with open("file1.txt","wb") as f1:
+    pickle.dump(p1,f1)
+
+with open("file1.txt", "rb") as f2:
+    print(pickle.load(f2))
+
+
+
+
+

DAY_21/File_Handling.py

@@ -0,0 +1,2 @@
+This is another method of writing in file
+Please check