Python：创建字典

Question

#---------------------------------------------------------#  Print days diff by Converting Unix timestamp to Readable Date/time#---------------------------------------------------------def convUnixTime(t):        return 1+(datetime.datetime.fromtimestamp(t*60*60*24)              - datetime.datetime.today()).days#---------------------------------------------------------# Read shadow file and check for account expires and create dictionary #---------------------------------------------------------with open( "/etc/shadow" ) as shadow:        for aLine in shadow:                filed = aLine.split(":")                f = filed[7]                try:                    f = int(f)                    f=convUnixTime(f)                except ValueError:                    f = "NULL"                if f != "NULL" and f <= 0:                        total_expired_users += 1                        expr_list[ filed[0] ] = f                elif f != "NULL" and f <= min_days:                        total_expring_users += 1                        expr_list[ filed[0] ] = f我已经创建了帐户已过期的用户词典，但是我认为这样做更加简洁明了。

Answer 1

使用try-except子句可能看起来更干净：

try:

    f = int(f)

    f=convUnixTime(f)

except ValueError:

    pass

else:

    if f <= 0:

      total_expired_users += 1

      expr_list[ filed[0] ] = f

    elif f <= min_days:

      total_expring_users += 1

      expr_list[ filed[0] ] = f

您也可以稍微更改顺序，以避免expr_list[filed[0]]重复：

if f <= min_days:

    expr_list[filed[0]] = f

    if f <= 0:

        total_expired_users += 1

    else:

        total_expiring_users += 1