各位前輩好，我有個沒幾行的function裡面用到exec函式，如下所示，主要是想把input
data裡的資料按照時間切分，生成新的data，不過執行後一直在報錯，想請問各位前輩我
哪裡用錯了，感謝。
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def cut_date(df, column_name, start, end):
for i in range(len(df[column_name])-1):
if df[column_name][i][:4] == str(start-1) and
df[column_name][i+1][:4] == str(start):
x = i
print('index %s: %s' % (x, df[column_name][x]))
for i in range(len(df[column_name])-1):
if df[column_name][i][:4] == str(end) and
df[column_name][i+1][:4] == str(end+1):
y = i
print('index %s: %s' % (y, df[column_name][y]))
exec('{}_mod = {}.iloc[x+1:y+1, :]'.format(df, df))
exec('{}_mod.reset_index(drop=True, inplace=True)'.format(df))
然後我用了下列指令執行 cut_date(df, '時間', 2013, 2016)
錯誤訊息如下
Traceback (most recent call last):
File
"/Users/User/opt/anaconda3/lib/python3.8/site-packages/IPython/core/interactiveshell.py",
line 3437, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-30-d5d2e894f930>", line 1, in <module>
cut_date(df, '日期', 2013, 2016)
File "<ipython-input-22-c0e363e719e0>", line 12, in cut_date
exec('{}_mod = {}.iloc[x+1:y+1, :]'.format(df, df))
File "<string>", line 1
日期
^
IndentationError: unexpected indent