Convert List to Pandas Dataframe Column

I need to Convert my list into a one column pandas dataframe

Current List (len=3):

    ['Thanks You',
     'Its fine no problem',
     'Are you sure']

Required Pandas DF (shape =3,):

    0 Thank You
    1 Its fine no problem
    2 Are you sure

Please note the numbers represent index in Required Pandas DF above.

Use:

    L = ['Thanks You', 'Its fine no problem', 'Are you sure']

    #create new df 
    df = pd.DataFrame({'col':L})
    print (df)

                       col
    0           Thanks You
    1  Its fine no problem
    2         Are you sure
    df = pd.DataFrame({'oldcol':[1,2,3]})

    #add column to existing df 
    df['col'] = L
    print (df)
       oldcol                  col
    0       1           Thanks You
    1       2  Its fine no problem
    2       3         Are you sure

Thank you DYZ:

    #default column name 0
    df = pd.DataFrame(L)
    print (df)
                         0
    0           Thanks You
    1  Its fine no problem
    2         Are you sure

From: stackoverflow.com/q/42049147