why append to dataframe doesnt work code example

Example 1: python dataframe appendisnt showing

# With Pandas, the dataframe needs to be re-assigned to take effect
houseitems = houseitems.append(df_new_items, ignore_index=True)

Example 2: dataframe not appending

#DF.append is not inplace, need to assign back
df8 = df8.append([s] * 2, ignore_index=True)
df8
          A         B         C         D
0  value aa  value bb  value cc  value dd
1  value aa  value bb  value cc  value dd