adrianmarkperea

def sum_all(*args):
    result = 0
    # args is a list
    for arg in args:
        result += arg
    return result

result = sum_all(1, 2, 3, 4, 5)
print(result) # => 15

adrianmarkperea

# The basic syntax is as follows:
# new_list = [<expression> <for loop(s)> <conditions>]

my_list = [1, 2, 3, 4, 5]
doubled = [x*2 for x in my_list] # no conditions in this case
print(doubled) # => [2, 4, 6, 8, 10]

# Equivalent to the following for loop:

doubled = []

adrianmarkperea

my_list = [1, 2, 5, 6, 9, 21, 30]
odds = [x for x in my_list if x % 2 == 1]
print(odds) # => [1, 5, 9, 21]

# Equivalent to the following for loop:
odds = []
for x in my_list:
    if x % 2 == 1:
        odds.append(x)

adrianmarkperea

 x, y = y, x
 print(x) # => 16
 print(y) # => 1

adrianmarkperea

a = 3.14

foo(b, c):
    return (4/3) * a * b^2 * c

adrianmarkperea

# value of pi
a = 3.14

# calculate the volume of a cylinder
# b -- radius
# c -- height
foo(b, c):
    return (4/3) * a * b^2 * c

adrianmarkperea

pi = 3.14

calculate_cylinder_volume(radius, height):
    return (4/3) * pi * radius^2 * height

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a = 1 # namespace {a: 1}

# does `a` exist in the namespace? Yes!
# proceed without error
print(a) # => 1

# does `b` exist in the namespace? No.
# Throw a `NameError`
print(b) # => NameError: name `b` is not defined.

adrianmarkperea

# scopes.py

# Scope A
a = 1
b = 16

def outer():
    # Scope B
    c = 24
    d = 'Hello, World!'

adrianmarkperea

i_am_global = 5

def foo():
    i_am_global = 10
    print(i_am_global)
    
foo()
print(i_am_global)

# outputs