从 python 字典中取值并一一传递

Question

我有下面提到的字典。

a={'name':['test1','test2'],'regno':['123','345'],'subject':         
  ['maths','science'],'standard':['3','4']}

我需要验证以下内容。

每个值计数字典都应该匹配。
从每个键中一一获取值，并将其一一传递给我的其他函数。

  name = 'test1'   regno = '123'   subject='maths'   standard='3'
  name = 'test2'   regno = '345'   subject='science'   standard='4'

我试过使用下面的代码，但我被困在这里寻找确切的方法。

a={'name':['test1','test2'],'regno':['123','345'],'subject':['maths','science'],'standard':['3','4']}
lengths = [len(v) for v in a.values()]
    if (len(set(lengths)) <= 1) == True:
        print('All values are same')`
    else:
        print('All values are not same')

需要您的帮助从每个键中逐一获取值并将其传递给函数。

Answer 1

尝试遍历字典项，然后遍历值中的列表：

for key, vals_list in a.items():
    if len(set(vals_list)) <= 1:
        print(f'{key}: All values are same!')

    # Will do nothing if `vals_list` is empty
    for value in vals_list:
        your_other_func(value)

Answer 2

您可以这样完成：

a={'name':['test1','test2'],'regno':['123','345'],'subject': 
['maths','science'],'standard':['3','4']}

w = [{'name':a['name'][i], 'regno':a['regno'][i], 'standard':a['standard'][i]} for i 
in range(len(a['name']))]

for x in range(len(w)):
    #your_func(w[x]['name'], w[x]['reno'], w[x]['standard'])
    print(w[x]['name'], w[x]['regno'], w[x]['standard'])

Answer 3

我会重建 a 到一个字典列表中，然后使用 dict-unpacking 动态地将字典提供给函数：

def func(name, regno, subject, standard):
    print("name={}, regno={}, subject={}, standard={}".format(name, regno, subject, standard))

a={'name':['test1','test2'],'regno':['123','345',],'subject':         
  ['maths','science'],'standard':['3','4']}

new_a = [dict(zip(a.keys(), x)) for x in list(zip(*a.values()))]
print(new_a)

for d in new_a:
    func(**d)

输出：

[{'name': 'test1', 'regno': '123', 'subject': 'maths', 'standard': '3'}, {'name': 'test2', 'regno': '345', 'subject': 'science', 'standard': '4'}]
name='test1', regno='123', subject='maths', standard='3'
name='test2', regno='345', subject='science', standard='4'

从 python 字典中取值并一一传递

Fetch value from python dictionary and pass one by one

python

python-2.7