pandas append a dataframe to another and assign back to code example

Example 1: how to adda vaslues to data frame

df = pd.DataFrame(columns=['A'])
for i in range(5):
    df = df.append({'A': i}, ignore_index=True)
df
   A
0  0
1  1
2  2
3  3
4  4

Example 2: append one row to pandas dataframe

df = df.append({'index1': value1, 'index2':value2,...}, ignore_index=True)