Question

我有一个词典，其中的键是日期格式为'％m /％d /％y'，我想分开这个，所以我可以按月绘制值。因此，目标只是将键从m / d / y转换为m，并在字典中保留相同的值。

months = dict.keys()
for i in months:
    i = dt.datetime.strptime(i[months],'%m/%d/%y').month

我收到此错误：

TypeError: string indices must be integers

感谢您的任何建议。

Answer 1

Python不是我的专业知识，但我对编程提供了足够的知识以提供以下内容（而不是对它的势利）：

from datetime import datetime

full_dates = ['1/1/17','2/1/17'] # best practice[1] is to use a list since this is an ordered sequence of items on an x-axis. Also, don't use dict since it's a reserved word in Python (it's used to create dictionaries using dict(...), which is the same as creating dict this way btw {...}[2])

months_only = []

for full_date in full_dates:
  months_only.append(datetime.strptime(month,'%m/%d/%y').month)

print(months_only) # outputs [1, 2]

[1] In Python, when to use a Dictionary, List or Set?

[2] https://developmentality.wordpress.com/2012/03/30/three-ways-of-creating-dictionaries-in-python/

Answer 2

months = dict.keys()
for i in months:
    i = dt.datetime.strptime(dict[i],'%m/%d/%y').month

使用datetime将字典键从日期转换为月份

2 个答案: