如何缩短ifelse语句的代码长度

if condition:
    result = expression1
else:
    result = expression2

result = expression1 if condition else expression2

if condition1:
    result = value1
elif condition2:
    result = value2
elif condition3:
    result = value3
else:
    result = value4

mapping = {
    condition1: value1,
    condition2: value2,
    condition3: value3
}
result = mapping.get(True, value4)

if condition1:
    result = function1()
elif condition2:
    result = function2()
elif condition3:
    result = function3()
else:
    result = function4()

def function1():
    # 执行对应操作并返回结果

def function2():
    # 执行对应操作并返回结果

def function3():
    # 执行对应操作并返回结果

def function4():
    # 执行对应操作并返回结果

mapping = {
    condition1: function1,
    condition2: function2,
    condition3: function3
}
result = mapping.get(True, function4)()