Question

我在文件中搜索字符串，但即使文件中有匹配的字符串，它也总是返回false。我哪里错了？

file = open('temp.txt', 'r')

def search(userinput, file):

    file.seek(0)
    filecontent = file.readlines()
    for i in filecontent:
        sp = i.split(' ')
        t_name = sp[0] + ' ' + sp[1]
        print (t_name)
    if (t_name == userinput):
        return True
    else:
        return False


searchstr = 'Peter Piper'
found = search(searchstr, file)
print (found)
file.close

TEMP.TXT

Peter Piper 20 30
Tom Cat 10 20
Jerry Mouse 30 50

Answer 1

与您用来解释具体问题的代码示例保持同步...

您的问题是，您实际上只是在for循环运行后检查t_name是否为userinput。你想要做的就是这个

Peter Piper 20 30
Tom Cat 10 20
Jerry Mouse 30 50




file = open('temp.txt', 'r')

def search(userinput, file):

    file.seek(0)
    filecontent = file.readlines()
    for i in filecontent:
        sp = i.split(' ')
        t_name = sp[0] + ' ' + sp[1]
        print (t_name)
        if (t_name == userinput):
            return True
    return False


searchstr = 'Peter Piper'
found = search(searchstr, file)
print (found)
file.close

在我的代码示例中，每次for循环运行时，它都会检查名称是否匹配，如果是，则结束函数并返回True。如果它永远不会结束函数并在for循环结束之前返回True，则表示没有名称是匹配的，并且在for循环完成后它应该返回False

Answer 2

你可以试试这个：

f = open('filename.txt').readlines()

f = [i.strip('\n') for i in f]

word = 'Peter Piper'
if any(word in i for i in f):
    print "word exists in file"

Answer 3

问题是你正在检查外部循环t_name是Jerry Mouse这是最后一个值，它应该是

file = open('temp.txt', 'r')

def search(userinput, file):
    file.seek(0)
    filecontent = file.readlines()
    for i in filecontent:
        sp = i.split(' ')
        #print(sp)
        t_name = sp[0] + ' ' + sp[1]
        print (t_name)
        if (t_name == userinput):
            return True
    return False


searchstr = 'Peter Piper'
found = search(searchstr, file)
print (found)
file.close

如何在python中搜索文件中的字符串？

TEMP.TXT

3 个答案: