found = False。为什么它写在代码中?

时间:2013-10-29 06:33:50

标签: python cgi

此代码从html获取数据并在afile中搜索。如果找到搜索,则在Web浏览器上进行打印。现在我查询为什么在b.append()行之后写入found = False。 b'coz如果我们不写它会在网络浏览器上打印文件中的所有数据

#!/usr/bin/python
import cgi

def get_search():

    found = False

    form = cgi.FieldStorage()
    Fname = form.getvalue('firstname', '')
    Lname = form.getvalue('lastname', '')
    Age = form.getvalue('age', 0)
    Gender = form.getvalue('gender', '')


    f = open("/tmp/abcd.txt","r")
    b = []
    for line in f:
        temp = line.split()

        Fsearch = temp[0]
        Lsearch = temp[1]
        Asearch = temp[2]
        Gsearch = temp[3]

        if Fname and Fname.lower() in Fsearch.lower():
            found = True

        if Lname and Lname.lower() in Lsearch.lower():
            found = True

        if Age and Age == Asearch:
            found = True

        if Gender and Gender in Gsearch:
            found = True
        if found:
            b.append(line)
        found = False
    f.close()
    print "Content-type:text/html\n"
    if len(b) == 0:
        print "No records found"
    else:
        for each in b:
             print each

get_search()

1 个答案:

答案 0 :(得分:2)

只需在每次循环传递结束时将found变量更新为False即可。这样做是因为新迭代应该以{{1​​}}开头(默认情况下在每次搜索开始时)。否则,一旦found = Falseline设置为found,它将始终保持True(对于以下True s,这是错误的。)

实际上,从我的观点来看,最好将这些变量放在循环的开头,作为一种初始化部分。 (但这是一个品味和'良好实践'的问题,在人们之间存在显着差异)