获取时间数据“”与格式“%Y-%m-%d %H:%M:%S.%f”不匹配

Question

我有一个日期时间错误，但只针对某些行。这是我的代码：

import requests
import csv
import datetime

def import_data_files():
  r = requests.get('https://raw.githubusercontent.com/anyoneai/notebooks/main/customers_and_orders/data/orders.csv')
  with open('./sample_data/orders.csv', 'wb') as f:
    f.write(r.content)
  
import_data_files()

path = './sample_data/orders.csv'
row_cnt = 0
orders_placed = 0
orders_date = []

with open(path, 'r') as fl:
  csv = csv.reader(fl, delimiter=',', quotechar='"')
  next(csv)
  for CustomerID, OrderID, Date, OrderTotal, ProductName, Price in csv:
    date = datetime.datetime.strptime(Date, '%Y-%m-%d %H:%M:%S.%f')
    if date.year == 2021:
      if date.month == 10:
        #print(Date)
        #print(date)
        orders_placed+=1
        row_cnt+=1
        if row_cnt > 234:
        #if row_cnt > 232:
          break


print(orders_placed)

如果我运行直到第 232 行，一切正常，但如果我运行多于此，我会收到错误消息。只解析没有时间数据转换的字符串我可以得到结果，但我不知道这是否可以，或者我可能遗漏了什么。这是字符串代码：

import requests
import csv

def import_data_files():
  r = requests.get('https://raw.githubusercontent.com/anyoneai/notebooks/main/customers_and_orders/data/orders.csv')
  with open('./sample_data/orders.csv', 'wb') as f:
    f.write(r.content)
  
import_data_files()

path = './sample_data/orders.csv'
orders_placed = 0

with open(path, 'r') as fl:
  csv = csv.reader(fl, delimiter=',', quotechar='"')
  next(csv)
  for CustomerID, OrderID, Date, OrderTotal, ProductName, Price in csv:
    date = Date.split(" ")
    date = Date.split("-")
    if date[0] == '2021':
      if date[1] == '10':
        orders_placed+=1

print(orders_placed)

Answer 1

许多行不包含日期字段。在这些情况下 Date 为空，因此您的 .strptime() 调用将失败。我建议您跳过这些行，例如：

import requests
import csv
import datetime

def import_data_files():
    r = requests.get('https://raw.githubusercontent.com/anyoneai/notebooks/main/customers_and_orders/data/orders.csv')
  
    with open('orders.csv', 'wb') as f:
        f.write(r.content)
  
import_data_files()

path = 'orders.csv'
orders_placed = 0
orders_date = []

with open(path, 'r') as fl:
    csv = csv.reader(fl, delimiter=',', quotechar='"')
    next(csv)
  
    for row_number, (CustomerID, OrderID, Date, OrderTotal, ProductName, Price) in enumerate(csv):
        if Date:
            date = datetime.datetime.strptime(Date, '%Y-%m-%d %H:%M:%S.%f')

            if date.year == 2021 and date.month == 10:
                orders_placed += 1

print(orders_placed)

这将显示：437

通常一行看起来像：

1900610,7692429,2020-01-12 13:52:40.677,200.0000,0981,200.0000

但是没有日期的失败行看起来像：

5014,5365,,120.0000,211,60.0000

获取时间数据“”与格式“%Y-%m-%d %H:%M:%S.%f”不匹配

Getting time data '' does not match format '%Y-%m-%d %H:%M:%S.%f'

python

csv

python-datetime