matplotlib中月日年图的必需格式

Question

I have a .csv file with one column containing the date using backslashes '/' to separate the month, day and year in one column. The following three columns contain a mean financial value, an upper financial value and a lower financial value. The data format look like the following example;

3/2/14  18338.98    18734.07    17943.88
3/3/14  18280.09    18675.2     17884.99
3/4/14  18220.26    18614.53    17825.98
3/5/14  18160.29    18551.71    17768.87

How can I get python to read in the date column and recognize it as a date in the format of month, day, year for eventual plotting with matlibplot?

Answer 1

Use the datetime module to create a datetime object

>>> import datetime
>>> dt = datetime.datetime.strptime('3/5/14', '%m/%d/%y')
>>> dt
datetime.datetime(2014, 3, 5, 0, 0)

Use the strftime method to create labels for the axis ticks .

>>> dt.strftime('%d%b%Y')
'05Mar2014'
>>>