cs61A discussion 1: control,Environment

#!/usr/bin/env python
# -*- coding: utf-8 -*-#

#-------------------------------------------------------------------------------
# Name:         disu01
# Description:  
# Author:       handa
# Date:         2022/4/18
#-------------------------------------------------------------------------------

def special_case():
    x = 10
    if x > 0:
        x += 2
    elif x < 13:
        x += 3
    elif x % 2 == 1:
        x += 4
    return x

r = special_case()
print(r)


def just_in_case():
    x = 10
    if x > 0:
        x += 2
    if x < 13:
        x += 3
    if x % 2 == 1:
        x += 4
    return x

r = just_in_case()
print(r)


def wears_jacket_with_if(temp, raining):
    """
    >>> wears_jacket_with_if(90, False)
    False
    >>> wears_jacket_with_if(40, False)
    True
    >>> wears_jacket_with_if(100, True)
    True
    """
    if temp < 60 or raining:
        return True
    else:
        return False

r = wears_jacket_with_if(100,True)
print(r)


def if_function(condition, true_result, false_result):
    """Return true_result if condition is a true value, and
    false_result otherwise.

    >>> if_function(True, 2, 3)
    2
    >>> if_function(False, 2, 3)
    3
    >>> if_function(3==2, 'equal', 'not equal')
    'not equal'
    >>> if_function(3>2, 'bigger', 'smaller')
    'bigger'
    """
    if condition:
        return true_result
    else:
        return false_result

def with_if_statement():
    """
    >>> result = with_if_statement()
    61A
    >>> print(result)
    None
    """
    if cond():
        return true_func()
    else:
        return false_func()
        
'''
这个运行正常
'''

def with_if_function():
    """
    >>> result = with_if_function()
    Welcome to
    61A
    >>> print(result)
    None
    """
    return if_function(cond(), true_func(), false_func())


def cond():
    print("enter cond")
    return True

def true_func():
    print("Welcome to")

def false_func():
    print("61A")

with_if_function()

'''
要求定义cond,true_func,false_func三个函数，当调用with_if_function函数时输出welcome to 
61A

这题主要是因为 表达式if_function(cond(), true_func(), false_func())在调用if_function时，先计算机出三个函数，所以会先输出所有结果，并不受if条件限制。

'''

函数帧

• 由于懒得截图，参考别人的答案

https://blog.csdn.net/Denny5608/article/details/120484514