Conditional Statements

if
if ... else
if ... [elif]* ... else # 0 or more elif statements
value if true else another_value

Naive initializations



In [1]:

    
a, b, c = 10, 15, 20

if boolean_expression:
    command0
    command1
    #...



In [2]:

    
if a > b:
    print('a > b')



In [3]:

    
if not a > b:
    print('b > a')









    



b > a



In [4]:

    
if a > b:
    print('a > b')

if boolean_expression:
    command0
    command1
    #...
else:
    command2
    command3
    #...



In [5]:

    
if a > b:
    print('a > b')
else:
    print('a < b')









    



a < b

Naive initializations



In [6]:

    
d, e = -1, -1

if boolean_expression:
    command0
    command1
    #...
elif: another_boolean_expression:
    command2
    command3
    #...
else:
    command4
    command5
    #...



In [7]:

    
if d > e:
    print('d > e')
elif e > d:
    print('e > d')
else:
    print('d == e')









    



d == e

'Syntactic sugar' to

if a < b and b < c:
    #...



In [8]:

    
if a < b < c:
    print('a < b < c')









    



a < b < c



In [9]:

    
if e < a < b < c:
    print('e < a < b < c')









    



e < a < b < c



In [10]:

    
if b > a < c:
    print('b > a < c')









    



b > a < c

'Ternary' statement - conditional assignment



In [11]:

    
x = a if a > b else b
print(x)



In [12]:

    
print('Greater of ({}, {}) -> {}'.format(a, b, a if a > b else b))









    



Greater of (10, 15) -> 15