Receiving commands with spaces

[NaoCoding]

I managed to create a command which may recieve a string 
which contains a large quantity of " " as a parameter. 
However, I found that discord.py will split every space,
and make a string into multiple parameters. 
Is it possible to recieve a parameter which contains " " ?
I have searched stackoverflow, however, seems there are not 
many people discussing about this issue.
(   Sorry for my bad English : (  )

What I want :
User input  !a This is an example 
and the bot will detect it as command a with parameter "This is an example"

What it does right now:
User input  !a This is an example 
and the bot will detect it as command a with 4 parameter This , is , a , example

[MCausc78]

you probably want use *:

@_bot.command()
async def f(ctx, *, x: str):
    await ctx.send(x)

[NaoCoding]

Thank u very much, that's what I need!