试图让用户选择他们想要使用的操作，然后运行相应的程序

Question

试图让用户选择他们想要使用的操作，然后运行相应的程序。不明白这里有什么问题？

这是我的代码

from collections import Counter
print (30 * '-')
print ("   M A I N - M E N U")
print (30 * '-')
print ("Program 1.Total Populations of the different continents")
print ("Program 2.Percentage Change(%) for different countries")
print (30 * '-')

Input1=1
Input2=2

## Get input ###
choice = int(input('Enter your choice [1-2] : '))

### Take action as per selected menu-option ###
while choice==1 or choice==2:
    if (choice == 1):
        counter1 = Counter()
    with open('a.txt') as f:
        for i in range(0,2):
            next(f)
        for line in f:
            splits = line.split(';')
            population = int(splits[3])
            continent = splits[-1].strip()
            counter1[continent] += population
# Print continents sorted by population
    for continent, pop_sum in counter1.most_common():
       print(continent, ":", pop_sum)

    else:
        counter2 = Counter()
    with open("a.txt") as f:
        for i in range(0,2):
            next(f)
        for line in f:
            splits = line.split(';')
            change = float(splits[6])
            country = splits[1].strip()
            counter2[country] += change      
    #Percentage Change By Countries"
    print()
    print ("Percentage Change By Countries")
    for country, change_sum in counter2.most_common():
        print(country, change_sum,"%")

样本数据 来自联合国的 2019 年世界人口数据 秩;国家; 2018; 2019; ％ 分享;流行变化； ％ 改变;大陆 1个；中国; 1427647786； 1433783686； 18.6； 6135900； 0.43;亚洲 2；印度; 1352642280； 1366417754； 17.7； 13775474; 1.02;亚洲 3；美国; 327096265； 329064917； 4.27； 1968652； 0.60；北美 4；印度尼西亚; 267670543; 270625568; 3.51; 2955025; 1.10；亚洲 5个；巴基斯坦; 212228286； 216565318； 2.81; 4337032; 2.04；亚洲 6；巴西; 209469323； 211049527； 2.74; 1580204； 0.75;南美洲 7;尼日利亚； 195874683； 200963599； 2.61； 5088916； 2.60；非洲 8个；孟加拉国; 161376708； 163046161； 2.11； 1669453; 1.03；亚洲 9;俄罗斯联邦; 145734038; 145872256； 1.89; 138218; 0.09;欧洲 10个；墨西哥; 126190788； 127575529; 1.65; 1384741; 1.10；北美

Answer 1

首先，我并没有真正理解你想要什么，但我纠正了你的缩进问题。

from collections import Counter

print (30 * '-')
print ("   M A I N - M E N U")
print (30 * '-')
print ("1.Total Populations of the different continents")
print ("2.Percentage Change(%) for different countries")
print (30 * '-')

## Get input ###
choice = int(input('Enter your choice [1-2] : '))

### Take action as per selected menu-option ###

#1st Operation
print ("Continents Sorted By Population")
while choice==1 or choice==2:
    if (choice == 1):
        counter1 = Counter()
        with open('a.txt') as f:
            for i in range(0,2):
                next(f)
            for line in f:
                splits = line.split(';')
                population = int(splits[3])
                continent = splits[-1].strip()
                counter1[continent] += population
        # Print continents sorted by population
        for continent, pop_sum in counter1.most_common():
             print(continent, ":", pop_sum)

#2nd operation
#Percentage Change By Countries
    elif choice==2:
        counter2 = Counter()
        with open("a.txt") as f:
            for i in range(0,2):
                next(f)
            for line in f:
                splits = line.split(';')
                change = float(splits[6])
                country = splits[1].strip()
                counter2[country] += change
print()

print ("Percentage Change By Countries")
for country, change_sum in counter2.most_common():
    print(country, change_sum,"%")