详解Python中三元运算符的使用

# Program to demonstrate conditional operator
a, b = 10, 20
# Copy value of a in min if a < b else copy b
min = a if a < b else b
print(min)

# Python program to demonstrate ternary operator
a, b = 10, 20
# Use tuple for selecting an item
# (if_test_false,if_test_true)[test]
# if [a<b] is true it return 1, so element with 1 index will print
# else if [a<b] is false it return 0, so element with 0 index will print
print( (b, a) [a < b] )
# Use Dictionary for selecting an item
# if [a < b] is true then value of True key will print
# else if [a<b] is false then value of False key will print
print({True: a, False: b} [a < b])
# lambda is more efficient than above two methods
# because in lambda  we are assure that
# only one expression will be evaluated unlike in
# tuple and Dictionary
print((lambda: b, lambda: a)[a < b]())

# Python program to demonstrate nested ternary operator
a, b = 10, 20
print ("Both a and b are equal" if a == b else "a is greater than b"
        if a > b else "b is greater than a")

a, b = 10, 20
if a != b:
    if a > b:
        print("a is greater than b")
    else:
        print("b is greater than a")
else:
    print("Both a and b are equal")

a=5
b=7
# [statement_on_True] if [condition] else [statement_on_false]
print(a,"is greater") if (a>b) else print(b,"is Greater")

# Define the data to be evaluated
data = [3, 5, 2, 8, 4]
# Use a for loop to evaluate each element in the data
for num in data:
    # Use the ternary operator to determine if the number is even or odd
    result = 'even' if num % 2 == 0 else 'odd'
    # Optionally, print the result of the ternary operator for each element
    print(f'The number {num} is {result}.')