Python PCEP Functions And Scopes

May 17, 20210 likes94 views

This document discusses functions and variable scopes in Python. It explains that a variable defined outside a function is accessible within the function but a variable defined inside a function is only accessible within the function's scope. It demonstrates how to extend the scope of a variable to the global scope using the global keyword. The key takeaways are that a variable outside a function is accessible inside unless redefined, a variable inside a function is only accessible within the function, and the global keyword makes a variable's scope global.

Functions and scopes
Module 3 Functions, Tuples, Dictionaries,
Data processing

Module 3 Functions and scopes
Functions and scopes
A variable existing outside a function has a scope inside the
functions' bodies.
def my_function():
print("Do I know that variable?", var)
var = 1
my_function()
print(var)
Do I know that variable? 1
1
The scope of a variable existing outside a function is
supported only when getting its value
def my_function():
var = 2
print("Do I know that variable?", var)
var = 1
my_function()
print(var)
Do I know that variable? 2
1

Module 3 Functions and scopes
Global keyword
def my_function():
global var
var = 2
print("Do I know that variable?", var)
var = 1
my_function()
print(var)
Extend a variable's scope in a way which includes the
functions' bodies
Do I know that variable? 2
2

Module 3 Functions and scopes
How the function interacts with
its arguments 1
def my_function(n):
print("I got", n)
n += 1
print("I have", n)
var = 1
my_function(var)
print(var)
I got 1
I have 2
1
def my_function(my_list_1):
print("Print #1:", my_list_1)
print("Print #2:", my_list_2)
my_list_1 = [0, 1]
print("Print #3:", my_list_1)
print("Print #4:", my_list_2)
my_list_2 = [2, 3]
my_function(my_list_2)
print("Print #5:", my_list_2)
Print #1: [2, 3]
Print #2: [2, 3]
Print #3: [0, 1]
Print #4: [2, 3]
Print #5: [2, 3]

Module 3 Functions and scopes
How the function interacts with
its arguments 2
def my_function(my_list_1):
print("Print #1:", my_list_1)
print("Print #2:", my_list_2)
del my_list_1[0] # Pay attention to this
line.
print("Print #3:", my_list_1)
print("Print #4:", my_list_2)
my_list_2 = [2, 3]
my_function(my_list_2)
print("Print #5:", my_list_2)
Print #1: [2, 3]
Print #2: [2, 3]
Print #3: [3]
Print #4: [3]
Print #5: [3]

Module 3 Functions and scopes
Key takeaways 1
A variable that exists outside a function has a scope inside the function
body unless the function defines a variable of the same name.
var = 2
def mult_by_var(x):
return x * var
print(mult_by_var(7)) # outputs: 14
def mult(x):
var = 5
return x * var
print(mult(7)) # outputs: 35
def mult(x):
var = 7
return x * var
var = 3
print(mult(7)) # outputs: 49

Module 3 Functions and scopes
Key takeaways 2
A variable that exists inside a function has a scope inside the function body.
def adding(x):
var = 7
return x + var
print(adding(4)) # outputs: 11
print(var) # NameError

Module 3 Functions and scopes
Key takeaways 3
You can use the global keyword followed by a variable name to make the
variable's scope global.
var = 2
print(var) # outputs: 2
def return_var():
global var
var = 5
return var
print(return_var()) # outputs: 5
print(var) # outputs: 5

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Python PCEP Functions And Scopes

1. Functions and scopes Module 3 Functions, Tuples, Dictionaries, Data processing

2. Module 3 Functions and scopes Functions and scopes A variable existing outside a function has a scope inside the functions' bodies. def my_function(): print("Do I know that variable?", var) var = 1 my_function() print(var) Do I know that variable? 1 1 The scope of a variable existing outside a function is supported only when getting its value def my_function(): var = 2 print("Do I know that variable?", var) var = 1 my_function() print(var) Do I know that variable? 2 1

3. Module 3 Functions and scopes Global keyword def my_function(): global var var = 2 print("Do I know that variable?", var) var = 1 my_function() print(var) Extend a variable's scope in a way which includes the functions' bodies Do I know that variable? 2 2

4. Module 3 Functions and scopes How the function interacts with its arguments 1 def my_function(n): print("I got", n) n += 1 print("I have", n) var = 1 my_function(var) print(var) I got 1 I have 2 1 def my_function(my_list_1): print("Print #1:", my_list_1) print("Print #2:", my_list_2) my_list_1 = [0, 1] print("Print #3:", my_list_1) print("Print #4:", my_list_2) my_list_2 = [2, 3] my_function(my_list_2) print("Print #5:", my_list_2) Print #1: [2, 3] Print #2: [2, 3] Print #3: [0, 1] Print #4: [2, 3] Print #5: [2, 3]

5. Module 3 Functions and scopes How the function interacts with its arguments 2 def my_function(my_list_1): print("Print #1:", my_list_1) print("Print #2:", my_list_2) del my_list_1[0] # Pay attention to this line. print("Print #3:", my_list_1) print("Print #4:", my_list_2) my_list_2 = [2, 3] my_function(my_list_2) print("Print #5:", my_list_2) Print #1: [2, 3] Print #2: [2, 3] Print #3: [3] Print #4: [3] Print #5: [3]

6. Module 3 Functions and scopes Key takeaways 1 A variable that exists outside a function has a scope inside the function body unless the function defines a variable of the same name. var = 2 def mult_by_var(x): return x * var print(mult_by_var(7)) # outputs: 14 def mult(x): var = 5 return x * var print(mult(7)) # outputs: 35 def mult(x): var = 7 return x * var var = 3 print(mult(7)) # outputs: 49

7. Module 3 Functions and scopes Key takeaways 2 A variable that exists inside a function has a scope inside the function body. def adding(x): var = 7 return x + var print(adding(4)) # outputs: 11 print(var) # NameError

8. Module 3 Functions and scopes Key takeaways 3 You can use the global keyword followed by a variable name to make the variable's scope global. var = 2 print(var) # outputs: 2 def return_var(): global var var = 5 return var print(return_var()) # outputs: 5 print(var) # outputs: 5

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