Pandas DataFrame 'Date' Column has no header / dtypes / not listed in df.columns
Question:
I’m importing data from nasdaqdatalink api
Two questions from this:
- (1) How is this already a Pandas DataFrame without me needing to type
df = pd.DataFrame ?
- (2) The ‘Date’ column, doesn’t appear to be a DataFrame column? if I try
df.columns it doesn’t show up in the index and obviously has no header. So I am confused on what’s happening here.
Essentially, I wanted to select data from this DataFrame between two dates, but the only way I really know how to do that is by selecting the column name first. However, I’m missing something here. I tried to rename the column in position [0] but that just created a new column named ‘Date’ with NaN values.
What am I not understanding? (I’ve only just begun learning Python, Pandas etc. ~1 month ago ! so this is about as far as I could go on my own without more help)
Answers:
There’s actually a better way, by keeping Date as the index, see the output of:
df.loc['2008-01-01':'2009-01-01']
df.reset_index() makes whatever the current index is into a column.
I’m importing data from nasdaqdatalink api
Two questions from this:
- (1) How is this already a Pandas DataFrame without me needing to type
df = pd.DataFrame? - (2) The ‘Date’ column, doesn’t appear to be a DataFrame column? if I try
df.columnsit doesn’t show up in the index and obviously has no header. So I am confused on what’s happening here.
Essentially, I wanted to select data from this DataFrame between two dates, but the only way I really know how to do that is by selecting the column name first. However, I’m missing something here. I tried to rename the column in position [0] but that just created a new column named ‘Date’ with NaN values.
What am I not understanding? (I’ve only just begun learning Python, Pandas etc. ~1 month ago ! so this is about as far as I could go on my own without more help)
There’s actually a better way, by keeping Date as the index, see the output of:
df.loc['2008-01-01':'2009-01-01']
df.reset_index() makes whatever the current index is into a column.