Question

我正在尝试让我的程序打印出在Python中出现搜索项的行。这是我目前的尝试：

search = input("Input your search term: ")  
found = 0
printline == False

with open ("search.txt", 'r') as data:
    for line in data: 
        if search.casefold() in line.casefold():
            found += line.casefold().count(search.casefold())  #adds the number of occurences within a line
            printline == True
        if printline == True:
            print(line)
        else: 
            printline == False

print("{} occurence(s) of the search item was/were found".format(found))

一直说“打印线”没有定义。我以为我在顶部定义了它。

更新：我删除了“printline”作为全局变量并将其移动到for循环的开头。现在代码打印每行文本（而不仅仅是包含搜索词的行）。这是我试图避免的，以及我想出“printline”变量的原因。

澄清一下，我试过了：

search = input("Input your search term: ")
found = 0


with open ("search.txt", 'r') as data:
    for line in data:
        if search.casefold() in line.casefold():
            found += line.casefold().count(search.casefold())  #adds the number of occurences within a line
            print(line)

print("{} occurence(s) of the search item was/were found".format(found))

我尝试过：

search = input("Input your search term: ")
found = 0


with open ("search.txt", 'r') as data:
    for line in data:
        printline = False
        if search.casefold() in line.casefold():
            found += line.casefold().count(search.casefold())  #adds the number of occurences within a line
            printline = True
        if printline == True:
            print(line)
        else:
            printline = False

print("{} occurence(s) of the search item was/were found".format(found))

并且两种方法最终都会吐出文本文件的每一行。有任何想法吗？感谢大家的帮助到目前为止。

Answer 1

您正在使用等效标记（==）来设置printline变量。

它应该是＆＃34; printline = False＆＃34;设置，＆＃34; printline == False＆＃34;比较

试试这个：

search = input("Input your search term: ")
found = 0
printline = False

with open ("search.txt", 'r') as data:
    for line in data:
        if search.casefold() in line.casefold():
            found += line.casefold().count(search.casefold())  #adds the number of occurences within a line
            printline = True
        if printline == True:
            print(line)
        else:
            printline = False

print("{} occurence(s) of the search item was/were found".format(found))

编辑：我们应该能够删除对printline变量的需求。

search = input("Input your search term: ")
found = 0

with open ("search.txt", 'r') as data:
    for line in data:
        if search.casefold() in line.casefold():
            found += line.casefold().count(search.casefold())  #adds the number of occurences within a line
            print(line) # This should only trigger if your if search.casefold() is in the line.casefold()

print("{} occurence(s) of the search item was/were found".format(found))

在python中出现搜索项的打印行

1 个答案: