关于面向对象编程的热点问题- Python

bmvo0sr5  于 2022-12-28  发布在  Python
关注(0)|答案(8)|浏览(149)

1.我正在解决一个关于coursera的练习论文，我就是不能解决这个问题，有人能帮忙吗？
1.显然，面向对象编程的主题在那门课程中是可选的，所以它是不是不重要或者不够有用？
问题是这样的：
“City类具有以下属性：名称、国家/地区（城市所在地）、海拔（以米为单位）和人口（根据最近的统计数据得出的近似值）。在比较指定的最小人口数的3个已定义示例时，填充max_elevation_city函数的空白以返回城市及其国家/地区的名称（用逗号分隔）。例如，针对最小人口数为100万的情况调用函数：max_elevation_city（1000000）应返回“保加利亚索菲亚”。

# define a basic city class
class City:
    name = ""
    country = ""
    elevation = 0 
    population = 0

# create a new instance of the City class and
# define each attribute
city1 = City()
city1.name = "Cusco"
city1.country = "Peru"
city1.elevation = 3399
city1.population = 358052

# create a new instance of the City class and
# define each attribute
city2 = City()
city2.name = "Sofia"
city2.country = "Bulgaria"
city2.elevation = 2290
city2.population = 1241675

# create a new instance of the City class and
# define each attribute
city3 = City()
city3.name = "Seoul"
city3.country = "South Korea"
city3.elevation = 38
city3.population = 9733509

def max_elevation_city(min_population):
    # Initialize the variable that will hold 
# the information of the city with 
# the highest elevation 
    return_city = City()

    # Evaluate the 1st instance to meet the requirements:
    # does city #1 have at least min_population and
    # is its elevation the highest evaluated so far?
    if ___
        return_city = ___
    # Evaluate the 2nd instance to meet the requirements:
    # does city #2 have at least min_population and
    # is its elevation the highest evaluated so far?
    if ___
        return_city = ___
    # Evaluate the 3rd instance to meet the requirements:
    # does city #3 have at least min_population and
    # is its elevation the highest evaluated so far?
    if ___
        return_city = ___

    #Format the return string
    if return_city.name:
        return ___
    else:
        return ""

print(max_elevation_city(100000)) # Should print "Cusco, Peru"
print(max_elevation_city(1000000)) # Should print "Sofia, Bulgaria"
print(max_elevation_city(10000000)) # Should print ""
python

8条答案

按热度按时间
czfnxgou

czfnxgou1#

下面的代码段就可以做到这一点：

...
    # Evaluate the 1st instance to meet the requirements:
    # does city #1 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city1.population >= min_population:
        return_city = city1
    # Evaluate the 2nd instance to meet the requirements:
    # does city #2 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city2.population >= min_population and city2.elevation > return_city.elevation:
        return_city = city2
    # Evaluate the 3rd instance to meet the requirements:
    # does city #3 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city3.population >= min_population and city3.elevation > return_city.elevation:
        return_city = city3

    #Format the return string
    if return_city.name:
        return f"{return_city.name}, {return_city.country}" 
    else:
        return ""

首先，if检查city 1是否超过给定的最小人口数。由于我们知道return_city尚未设置，因此不需要检查海拔是否最大。
第二个和第三个if检查相同的情况，但如果高程大于先前设置的高程，则进行额外检查。
在return语句中，我们使用f string来格式化。
我想知道你到底被困在哪里了，因为这里没有发生OOP魔法。
关于您提出的OOP是否重要的问题：一如既往--这取决于！了解python中的OOP将给予你更深入地理解python是如何工作的，而OOP通常在许多项目中是有帮助的。但是如果你只想将python用作脚本语言，你就不需要太多的OOP知识。

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8oomwypt

8oomwypt2#

您还可以使用此

...
            if city1.population >= min_population and city1.elevation > return_city.elevation:
                return_city = city1
        
            if city2.population >= min_population and city2.elevation >return_city.elevation:
                return_city = city2
         
            if city3.population >= min_population and city3.elevation > return_city.elevation:
                return_city = city3
    
            if return_city.name:
                return "{}, {}".format(return_city.name, return_city.country)
            else:
                return ""
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3htmauhk

3htmauhk3#

if city1.population >= min_population:
    return_city = city1

elif  city2.population >= min_population:
    return_city = city2

elif  city3.population >= min_population:
    return_city = city3

if return_city.name:
    return "{}, {}".format(return_city.name, return_city.country)
else:
    return ""
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50few1ms

50few1ms4#

# Evaluate the 1st instance to meet the requirements:
# does city #1 have at least min_population and
# is its elevation the highest evaluated so far?
if city1.population >= min_population:
    return_city = city1
# Evaluate the 2nd instance to meet the requirements:
# does city #2 have at least min_population and
# is its elevation the highest evaluated so far?
if city2.population >= min_population and city2.elevation > return_city.elevation:
    return_city = city2
# Evaluate the 3rd instance to meet the requirements:
# does city #3 have at least min_population and
# is its elevation the highest evaluated so far?
if city3.population >= min_population and city3.elevation > return_city.elevation:
    return_city = city3

#Format the return string
if return_city.name:
    return ("{}, {}".format(return_city.name, return_city.country))
else:
    return ""
赞(0）分享  回复(0）举报  2022-12-28
ev7lccsx

ev7lccsx5#

# define a basic city class
class City:
    name = ""
    country = ""
    elevation = 0 
    population = 0

# create a new instance of the City class and
# define each attribute
city1 = City()
city1.name = "Cusco"
city1.country = "Peru"
city1.elevation = 3399
city1.population = 358052

# create a new instance of the City class and
# define each attribute
city2 = City()
city2.name = "Sofia"
city2.country = "Bulgaria"
city2.elevation = 2290
city2.population = 1241675

# create a new instance of the City class and
# define each attribute
city3 = City()
city3.name = "Seoul"
city3.country = "South Korea"
city3.elevation = 38
city3.population = 9733509

def max_elevation_city(min_population):
    highest_elevation = 0
    # Initialize the variable that will hold 
    # the information of the city with 
    # the highest elevation 
    return_city = City()

    # Evaluate the 1st instance to meet the requirements:
    # does city #1 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city1.population >= min_population and city1.elevation > return_city.elevation:
        highest_elevation = return_city.elevation 
        return_city = city1
    # Evaluate the 2nd instance to meet the requirements:
    # does city #2 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city2.population >= min_population and city2.elevation > return_city.elevation:
        highest_elevation = return_city.elevation 
        return_city = city2
    # Evaluate the 3rd instance to meet the requirements:
    # does city #3 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city3.population >= min_population and city3.elevation > return_city.elevation:
        highest_elevation = return_city.elevation 
        return_city =  city3

    #Format the return string
    if return_city.name:
        return "{}, {}".format(return_city.name, return_city.country)
    else:
        return ""

print(max_elevation_city(100000)) # Should print "Cusco, Peru"
print(max_elevation_city(1000000)) # Should print "Sofia, Bulgaria"
print(max_elevation_city(10000000)) # Should print ""

#Outputs
#Cusco, Peru
#Sofia, Bulgaria
#
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soat7uwm

soat7uwm6#

您可以像这样简化解决方案

if city1.population >= min_population:
    return_city = city1

我们确保城市拥有所需的最低人口数，并且拒绝之前的城市要求

if city2.population >= min_population and not return_city.name:
    return_city = city2

我们确保城市拥有所需的最低人口数，并且拒绝之前的城市要求

if city3.population >= min_population and not return_city.name:
        return_city = city3

    if return_city.name:
        return ','.join([return_city.nam ,return_city.country]) 
    else:
        return ""
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l0oc07j2

l0oc07j27#

# define a basic city class
class City:
    name = ""
    country = ""
    elevation = 0 
    population = 0

# create a new instance of the City class and
# define each attribute
city1 = City()
city1.name = "Cusco"
city1.country = "Peru"
city1.elevation = 3399
city1.population = 358052

# create a new instance of the City class and
# define each attribute
city2 = City()
city2.name = "Sofia"
city2.country = "Bulgaria"
city2.elevation = 2290
city2.population = 1241675

# create a new instance of the City class and
# define each attribute
city3 = City()
city3.name = "Seoul"
city3.country = "South Korea"
city3.elevation = 38
city3.population = 9733509

def max_elevation_city(min_population):
    # Initialize the variable that will hold 
# the information of the city with 
# the highest elevation 
    return_city = City()

    # Evaluate the 1st instance to meet the requirements:
    # does city #1 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city1.population >= min_population:
        return_city = city1
    # Evaluate the 2nd instance to meet the requirements:
    # does city #2 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city2.population >= min_population and city2.elevation > return_city.elevation:
        return_city = city2
    # Evaluate the 3rd instance to meet the requirements:
    # does city #3 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city3.population >= min_population and city3.elevation > return_city.elevation:
        return_city = city3

    #Format the return string
    if return_city.name:
        return f"{return_city.name}, {return_city.country}" 
    else:
        return ""
赞(0）分享  回复(0）举报  2022-12-28
ekqde3dh

ekqde3dh8#

# define a basic city class
    class City:
        name = ""
        country = ""
        elevation = 0 
        population = 0

# create a new instance of the City class and
# define each attribute
city1 = City()
city1.name = "Cusco"
city1.country = "Peru"
city1.elevation = 3399
city1.population = 358052

# create a new instance of the City class and
# define each attribute
city2 = City()
city2.name = "Sofia"
city2.country = "Bulgaria"
city2.elevation = 2290
city2.population = 1241675

# create a new instance of the City class and
# define each attribute
city3 = City()
city3.name = "Seoul"
city3.country = "South Korea"
city3.elevation = 38
city3.population = 9733509

def max_elevation_city(min_population):
    # Initialize the variable that will hold 
# the information of the city with 
# the highest elevation 
    return_city = City()

    # Evaluate the 1st instance to meet the requirements:
    # does city #1 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city1.population > min_population and city1.elevation > return_city.elevation:
        return_city = city1
    # Evaluate the 2nd instance to meet the requirements:
    # does city #2 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city2.population > min_population and city2.elevation > return_city.elevation:
        return_city = city2
    # Evaluate the 3rd instance to meet the requirements:
    # does city #3 have at least min_population and
    # is its elevation the highest evaluated so far?
    if city3.population > min_population and city3.elevation > return_city.elevation:
        return_city = city3

    #Format the return string
    if return_city.name:
        return "{}, {}".format(return_city.name, return_city.country)
    else:
        return ""

print(max_elevation_city(100000)) # Should print "Cusco, Peru"
print(max_elevation_city(1000000)) # Should print "Sofia, Bulgaria"
print(max_elevation_city(10000000)) # Should print ""
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