Try:
# Create an example dataframe
df = pd.DataFrame({"genres":["Fantasy|Sci-Fi",
"Action|Adventure|Fantasy",
"Thriller",
"Action|Adventure|Thriller|bbv","Action","Action|Adventure|thriller"]})
# Get a dataframe with as many columns as there are genres
df = df.genres.str.get_dummies(sep = "|")
# Get the genres as values
df = df.multiply(df.columns)
# Rename the columns to have the genre id
df.columns = ["genre_" + str(x) for x in range(len(df.columns))]
Input:
Output:
