Python中作为字符串的字典输出

Question

查看以下格式的打印报表，还需要包括输入的任何新国家和人口。我可以让代码以dict格式显示附加词典，但很难以以下格式显示。我做错了什么

Expected Output:

   Vatican has Population 800
   Vatican has Population 10200
   ...

def main():
        countryPop = {'Vatican': 800, 'Tuvalu': 10200, 'Nauru': 11000, 'Palau': 17900,
                      'San Marino': 33420, 'Monaco': 38300, 'Marshall Islands': 55500}

        # while loop to repeat the input request and population display until 0 is entered
        while True:
            ctry = input('Enter country:')
            population = countryPop.get(ctry)
            print('Population:',population)
            if ctry == '0':
                break

            # Else if Loop meant to activate if a country unknown to the original dictionary is entered
            elif ctry not in countryPop:
                popIn = input("Country Pop:")
                countryPop[ctry] = popIn

        # printing the new list after breaking from the loop
        for ctry in countryPop:
            print(str(ctry)+" has population "+str(popIn))
    if __name__ == '__main__':
        main()

Answer 1

这将打印您想要的内容

for ctry, pop in countryPop.items():
    print(f"{ctry} has population {pop}")

Answer 2

您可以使用for key in dict语法来迭代字典的键。然后，在循环中，可以使用dict[key]读取该键中保存的内容。因此，以下措施将起作用：

countryPop = {'Vatican': 800, 'Tuvalu': 10200, 'Nauru': 11000, 'Palau': 17900,
                      'San Marino': 33420, 'Monaco': 38300, 'Marshall Islands': 55500}

for key in countryPop:
    print(key + " has Population " + str(countryPop[key]))

输出：

Palau has Population 17900

Tuvalu has Population 10200

Vatican has Population 800

San Marino has Population 33420

Marshall Islands has Population 55500

Monaco has Population 38300

Nauru has Population 11000