3

My abc.txtfile looks like this

Mary    Kom     28 F
Emon    Chatterje  32 M
Sunil   Singh  35 M

Now i am getting the desired result with the following traceback:Please help me out. I am not getting where am i going wrong

Enter for Search Criteria
1.FirstName  2.LastName  3.Age  4.Gender  5.Exit 1
Enter FirstName :m
Mary Kom 28 F
Emon Chatterje 32 M
Traceback (most recent call last):
 File "testcode.py", line 50, in <module>
    if (records.searchFName(StringSearch)):
  File "testcode.py", line 12, in searchFName
    return matchString.lower() in self.fname.lower()
 AttributeError: 'NoneType' object has no attribute 'lower'

My Code:

#!usr/bin/python
import sys

class Person:
    def __init__(self, firstname=None, lastname=None, age=None, gender=None):
        self.fname = firstname
        self.lname = lastname
        self.age = age
        self.gender = gender
    def searchFName(self, matchString):

        return matchString.lower() in self.fname.lower()

    def searchLName(self, matchString):

        return matchString.lower() in self.lname.lower()

    def searchAge(self, matchString):

        return str(matchString) in self.age

    def searchGender(self, matchString):

        return matchString.lower() in self.gender.lower()

    def display(self):

        print self.fname, self.lname, self.age, self.gender


f= open("abc","r")
list_of_records = [Person(*line.split()) for line in f]
f.close()
found = False
n=0

n1 = raw_input("Enter for Search Criteria\n1.FirstName  2.LastName  3.Age  4.Gender      5.Exit " )

if n1.isdigit():
    n = int(n1)
else:
    print "Enter Integer from given"
    sys.exit(1)
if n == 0 or n>5:
    print "Enter valid search "
if n == 1:
    StringSearch = raw_input("Enter FirstName :")
    for records in list_of_records:
        if (records.searchFName(StringSearch)):
            found = True
            records.display()

    if not found:
        print "No matched record"

if n == 2:
    StringSearch = raw_input("Enter LastName :")
    for records in list_of_records:
        if records.searchLName(StringSearch):
            found = True
            records.display()

   if not found:
        print "No matched record"

if n == 3:
    StringSearch = raw_input("Enter Age :")
    if (StringSearch.isdigit()):
        StringSearch1 = int(StringSearch)
    else:
        print "Enter Integer"
        sys.exit()
    for records in list_of_records:
        if records.searchAge(StringSearch):
            found = True
        records.display()

    if not found:
        print "No matched record"

if n == 4:
    StringSearch = raw_input("Enter Gender(M/F) :")
    for records in list_of_records:
        if records.searchGender(StringSearch):
           found = True
           records.display()
    if not found:
        print "No matched record"

if n == 5:
    sys.exit(1)

Please help solve my problrm to where am i going wrong ??

4

1 回答 1

7

你有一Person()堂没有firstname. 您从文件中的空行创建了它：

list_of_records = [Person(*line.split()) for line in f]

空行导致空列表：

>>> '\n'.split()
[]

这会导致Person(*[])被调用，因此Person()创建了一个没有参数的实例，保留默认值firstname=None。

跳过空行：

list_of_records = [Person(*line.split()) for line in f if line.strip()]

您可能还希望默认为空字符串，或者None在将属性视为字符串之前专门测试值：

def searchFName(self, matchString):
    return bool(self.fname) and matchString.lower() in self.fname.lower()

这里bool(self.fname)返回False空值或值，当没有匹配的名字时None为您提供快速返回值：False

>>> p = Person()
>>> p.fname is None
True
>>> p.searchFName('foo')
False
于 2013-10-23T09:15:31.190 回答