是否基于现有数据框架创建新的pandas数据框行？

import pandas as pd

data = {'col1': 1, 'col2': 2}
df = pd.DataFrame(data, index=[0])
new_row = {'col1': 3, 'col2': 4}
df = df.append(new_row, ignore_index=True)

import pandas as pd

data = {'col1': [1, 2], 'col2': [2, 3]}
df = pd.DataFrame(data)
new_row = [3, 4]
df.loc[len(df)] = new_row

import pandas as pd

data = {'col1': [1, 2], 'col2': [2, 3]}
df = pd.DataFrame(data)
new_row = pd.Series([3, 4], index=df.columns)
df = df.append(new_row, ignore_index=True)