python def

1#Letters, Nums,
2#& underscores
3#only, can't	=7  
4#start w/ num	|		  _ 5 is the default value if no
5# 	  |			|		 |  value is passed
6#	  v         v        v
7def funcName(param1, param2=5): #The colon terminates func header 
8	str(param1) #Typecasting is temparary
9    strVar = str(param1) # To make typecast perma, assign to var
10    param1 = param2 # 5 is passed to param1 
11    return param1 # 5 is returned
12#	  ^      ^
13#     |		 |_ return value is optional, if no return value, func 
14  #Optional		will end returning to func call
15  #return
16
17x = funcName(7)
18print(x) # prints 5

1# declare a function
2def function_name(param) :
3  # content inside a function
4
5function_name(param) # calling function

1OK, basically def function() is a block where you will have one task that you can repeat all over again in the code to make it look short and clean

1
2  def my_function():
3  print("Hello from a function")
4
5
6  my_function() 

1# You can make a function by using the [def] keyword
2def foo():
3	print("Hello")
4
5# You can run it by calling it as such
6foo()
7
8def add(numA, numB):
9  print(numA+numB)
10  # or 
11  return numA+numB
12
13num = add(1, 5)
14print(num)

1#Use this to shortern a task that you may want to repeat
2#Used for making custom commands
3def paste(a, b)
4	for i in b:
5    	print(a)
6      
7      
8while True:
9  paste("Python is Cool!!!", 3)
10  
11#Output:
12#Python is Cool!!!
13#Python is Cool!!!
14#Python is Cool!!!
15
16
17
18
19
20## - ANOTHER EXAMPLE - ##
21
22
23
24
25
26happy = "NEUTRAL"
27
28def yes():
29  happy="TRUE"
30  print("Thank you!")
31  
32def no():
33  happy="FALSE"
34  print("That's not nice!")
35  
36answer=str(input("Do you like my new shoes?   (y/n)  ")
37if answer=="yes" or "y" or "Yes" or "Y" or "YES":
38  yes()
39elif answer=="no" or "n" or "No" or "N" or "NO":
40  no()