def gerar_matriz (n_linhas, n_colunas):
return [[" "]*n_colunas for _ in range(n_linhas)]
print(gerar_matriz(2, 3))
ZGVmIGdlcmFyX21hdHJpeiAobl9saW5oYXMsIG5fY29sdW5hcyk6CiAgICByZXR1cm4gW1siICJdKm5fY29sdW5hcyBmb3IgXyBpbiByYW5nZShuX2xpbmhhcyldCiAgICAKcHJpbnQoZ2VyYXJfbWF0cml6KDIsIDMpKQ==