我datetime在使用 Python 中的模塊時遇到了一些問題。我有來自 csv 文件的數據：user_id,timestamp563,0:00:21671,0:00:26780,0:00:28這是我的代碼：import csvfrom datetime import datetimepath = "/home/haldrik/dev/python/data/dataset.csv"file = open(path, newline='')reader = csv.reader(file, delimiter=',')header = next(reader) # Ignore first row.data = []for row in reader: # row = [user_id, timestamp] user_id = row[0] timestamp = datetime.strptime(row[1], '%H:%M:%S').time() data.append([user_id, timestamp])該代碼拋出此錯誤：Traceback (most recent call last): File "/home/haldrik/dev/python/instances_web_site.py", line 15, in <module> date = datetime.strptime(row[1], '%H:%M:%S').time() File "/usr/lib/python3.8/_strptime.py", line 568, in _strptime_datetime tt, fraction, gmtoff_fraction = _strptime(data_string, format) File "/usr/lib/python3.8/_strptime.py", line 349, in _strptime raise ValueError("time data %r does not match format %r" %ValueError: time data '' does not match format '%H:%M:%S'我找不到錯誤在哪里。我可以看到數據格式符合指定的時間格式。倒出 cvs 導入步驟，我可以確保它有效，請參見這段代碼（未包含在上面的代碼中）：data_import = [row for row in reader]print(data_import[0])它輸出這個：['563','0:00:21']
1 回答
夢里花落0921
TA貢獻1772條經驗 獲得超6個贊
您對 timestamp 列中的一個或多個值有疑問，其中一行看起來像440,并且會導致time data '' does not match format '%H:%M:%S'
包裹date = datetime.strptime(row[1], '%H:%M:%S').time()在一個try-except塊中。
test.csv
user_id,timestamp
563,0:00:21
671,0:00:26
780,0:00:28
440,
代碼
import csv
from datetime import datetime
path = "test.csv"
file = open(path, newline='')
reader = csv.reader(file, delimiter=',')
header = next(reader) # Ignore first row.
data = []
for row in reader:
# row = [user_id, timestamp]
user_id = row[0]
try:
timestamp = datetime.strptime(row[1], '%H:%M:%S').time()
except ValueError as e:
timestamp = row[1]
# continue # use this if you do not want the row added to data, comment it out otherwise
data.append([user_id, timestamp])
print(data)
[out]:
[['563', datetime.time(0, 0, 21)], ['671', datetime.time(0, 0, 26)], ['780', datetime.time(0, 0, 28)], ['440', '']]
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