id-customer      status
1                 Won
1                 Won
2                 Won
2                 Won
3                 Not won

id-customer      status           winrate
1                 Won             1
1                 Won             1
2                 Won             1
2                 Won             1
3                 Not won         0

df_winrate=df.groupby(['id-customer'],as_index=False)['status'].sum()