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df_new = df_source[["A_1", "B_1"]]
if 'A_2' in df_new.columns:
# Also add A_2, B_2 columns in df_new, but I don't know how to add the columns to the created df_new.
< /code>
statt < /p>
df_new = df_source[["A_1", "B_1"]]
if 'A_2' in df_new.columns:
df_new = df_source[["A_1", "B_1", "A_2", "B_2"]]

Ich habe eine df_source. df_new.
Das resultierende df_new kann entweder zwei Spalten oder vier Spalten enthalten.[code]df_new = df_source[["A_1", "B_1"]]
if 'A_2' in df_new.columns:
# Also add A_2, B_2 columns in df_new, but I don't know how to add the columns to the created df_new.
< /code>
statt < /p>
df_new = df_source[["A_1", "B_1"]]
if 'A_2' in df_new.columns:
df_new = df_source[["A_1", "B_1", "A_2", "B_2"]]

[/code]