如何使用for循环在python中访问字典中的元素？

Question

I need to extract information from a dictionary, but can't figure how to access data.

I have:

from datetime import timedelta, date
from dateutil.relativedelta import relativedelta
import numpy as np

start_date = date(2017,1,1);
final_date = date.today() + relativedelta(months=2);

def datarange(start_date, final_date):
    for n in range((final_date-start_date).days+1):
        yield start_date + timedelta(n)

PayDayTable = {i:np.zeros(5) for i in datarange(start_date, final_date)}

and I can do:

print(PayDayTable)
print(PayDayTable[date.today()])
print(PayDayTable[date.today()][0])
print(PayDayTable[date.today()][1:3])

but when I do:

for item in PayDayTable:
    print(item)

How can I access the values of the PayDayTable dictionary by iterating over the items with for loop ?

Edit:

I was looking for Python 2 documentation while I was using Python 3.6.

So instead of doing something like:

for item in PayDayTable.iteritems():
    pass

I've learned that I should do:

for item in PayDayTable.items():
    print(item[1][0])

Answer 1

type(item) is datetime.date , it is not iterable (you can't do item[0]). Each element ( item in your code) in your PayDayTable is a date.

If you need the dates - just work with elements of PayDayTable . But if you want to get the associated value with the date key by iterating the dictionary using a for loop , then you could do something like:

for item in PayDayTable:
    print(PayDayTable[item])