minte9
LearnRemember / PYTHON



Execution 

 
""" When you type a statement, the interpreter executes it
"""

n = 17    # stmt
print(n)  # stmt

"""
    17
"""

Assigment 

 
""" An assignment creates a variable and gives it value
"""

n = 17
n = n + 24


# You can assign multiple variables in one line
a, b, c = 1, 2, 3

# Output variables
print(n) 
print(a, b, c)


""" A variable must be assigned before use
"""

y = 0
y = y + 1
assert y == 1 # pass

# Variable not assigned before use
try:
    z = z + 1
except NameError:
    print('Variable z not defined')



""" In Python it is legal to reassign a variable
    An assignment can make two variables equal, but not permanent
"""

x = 5
x = 7

assert x == 7 # pass
assert x != 5 # pass

a = 1
b = 1

assert a == b # pass

a = 2

assert a != b # pass


"""
    41
    1 2 3
    Variable z not defined
"""

Conditional 

 
""" Conditional statement
    We can check condtions and change the behavior
"""

n = 20

if n % 10 == 0:
    print("n is divisible by 10")
elif n % 10 > 0:
    print("n is not divisible by 10") 
else:
    pass


# Conditional expression (more concisely)
a = 0
msg = "positive" if a >= 0 else "negative"
print("a is", msg)


# Conditional expressions are very useful within lambda expressions
func = lambda x: 'even' if x % 2 == 0 else 'odd'
print(func(2))
print(func(3))

While 

 
""" While statement
    The syntax is similar to a function definition.
"""

def countdown(n):
    while(n > 0):
        print(n)
        n = n -1

countdown(5)

User input 

 
""" Sometimes you want to take input from user until they type quit
"""
  
while True:
    line = input('> ')
    if (line == 'quit'): 
        break
    print(line)

print('Done')

Multiline 

 
""" Split a single statemenbt on multple lines with `backslash` \
"""

print("Hello " + \
    "World")

"""
    Hello World
"""





References





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