如何使用 python while 循环打印地址为伯明翰的所有名字？

Question

dictionary_list = [    {"firstname": "Steven", "lastname": "Walker", "address": "Birmingham"},    {"firstname": "James", "lastname": "Kay", "address": "Birmingham"},    {"firstname": "Alice", "lastname": "Gibson", "address": "Birmingham"},    {"firstname": "John", "lastname": "Doe", "address": "Birmingham"},    {"firstname": "evan", "lastname": "spencer", "address": "Derby"},    {"firstname": "Dean", "lastname": "Davis", "address": "Leeds"},    {"firstname": "Jade", "lastname": "wilson", "address": "Birmingham"},    {"firstname": "Emma", "lastname": "James", "address": "Birmingham"},    {"firstname": "Alex", "lastname": "Windsor", "address": "Birmingham"},    {"firstname": "Rebekah", "lastname": "Daphney", "address": "London"},]如何使用python while循环打印地址为伯明翰的所有名字？我不知道从哪里开始。

Answer 1

只是因为您要求使用while循环实现：

i = 0

while i < len(dictionary_list):

    d = dictionary_list[i]

    if d['address'] == 'Birmingham':

        print(d['firstname'])

    i += 1

Answer 2

您应该从 pandas 库开始，它是在 python 上开始操作数据最直观的：

    import pandas as pd

    df=pd.DataFrame(dictionary_list)

    df2 = df[df['address']=="Birmingham"]

    print(df2["firstname"])

Answer 3

您首先不应该使用 awhile loop因为您的情况没有意义，您最好应该使用这样for loop的：

for d in dictionary_list:

    if d['address'] == 'Birmingham':

        print([d['firstname'])

但你可以按照alani 的建议，简单地在一行中完成此操作：

print([d['firstname'] for d in dictionary_list if d['address'] == 'Birmingham'])