以下のkの値を指定することで、1DataFrameあたりの行数を指定することが可能
k = 10000 # 1DataFrameあたりの行数
dfs = [df.loc[i:i+k-1, :] for i in range(0, len(df), k)]
for i, df_i in enumerate(dfs):
fname = str(i) + ".csv"
df_i.to_csv(fname)
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