python - python错误检查

Question

我正在使用下面的代码。如何添加错误检查。
如果有任何错误，请更换并继续阅读
例如:如果音量为N \ a或丢失，则替换为'a value'。
不要跳过行，不要停下来。

reader = csv.reader(idata.split("\r\n"))

stocks = []
for line in reader:
    if line == '':
        continue

    stock, price, volume, stime = line
    price = float(price)
    volume = int(volume)

    stocks.append((stock, price, volume, stime))

Answer 1

执行以下操作:

def isRecordValid(stock,price,volume,stime):
    #do input validation here, return True if record is fine, False if not.  Optionally raise an Error here and catch it in your loop
    return True

reader = csv.reader(idata.split("\r\n"))

stocks = []
for line in reader:
    if line == '':
        continue

    stock, price, volume, stime = line
    try:
        if isRecordValid(stock,price,volume,stime):
            price = float(price)
            volume = int(volume)
            stocks.append((stock, price, volume, stime))
        except Exception as e:
            print "either print or log and error here, using 'except' means you can continue execution without the exception terminating your current stack frame and being thrown further up"

基本上定义另一种方法(或内联执行)以验证库存，价格，数量和时间是否都符合您的期望。我也会尝试在这里捕获任何错误，以防您的float()或int()调用出于任何原因将价格和交易量字符串转换为预期类型失败。