I get an error :ValueError: '%' is a bad directive in format '% Y-% m'

<#read in date format
dateparse=lambda dates:pd.datetime.strptime(dates,'% Y-% m')
data=pd.read_csv('C:\\Users\\rajesh\\STATISTICS WITH PYTHON\\Airpassengers.csv',index_col='Month',date_parser=dateparse,dtype='float')
data.head()>

I get an error :ValueError: ‘%’ is a bad directive in format ‘% Y-% m’

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

the format is not understandable by strptime.
remove the spaces between % and Y, and between % and m.
it should be like this: %Y-%m