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As the data seems to me a string, Voce can use the method slice
df['hora'] = df['coluna'].str.slice(10)
# ou usando índices ↓
# df['hora'] = df['coluna'].str[10]
df['data'] = df['coluna'].str.slice(0,10)
# ou usando índices ↓
# df['data'] = df['coluna'].str[0:10]
See the working code on ideone
How do you want to replace you can just put:
df['Assinatura.Cadastro'] = df['Assinatura.Cadastro'].str.slice(0,10)
# ou usando índices ↓
# df['Assinatura.Cadastro'] = df['Assinatura.Cadastro'].str[0:10]
Thiago, I edited your question to facilitate the search for others with the same problem, if you find that I changed the direction a lot you can [Edit] or if you want you can return revisions
– Icaro Martins
Perfect, no problem.
– Thiago Ramos De Oliveira