如何在python的文件中搜索单词是否存在？

Question

我有一个名为“dictionary.txt”的文件，其中包含按字母顺序排列的字典中的单词。

我想搜索某些单词是否在这本词典中。 谁能帮我编写可以打开这个文件的代码，然后我写一个单词作为输入，然后我收到一个输出，说明该单词是否在字典文件中？

这是我目前所拥有的：-

dicfile = open('dictionary.txt', 'r') 
word = input('enter a word: ') 
if word in dicfile: 
    print('true') 
else: 
    print('false')

Answer 1

fd = open("abc.txt","r")    # open the file in read mode
file_contents = fd.read()   # read file contents
word = "hello"              # input word to be searched
if(word in file_contents):  # check if word is present or not
    print("word found")
else:
    print("word not found")
fd.close()                  # close the file

Answer 2

你差不多了，只是需要更多关于 python 文件处理的信息。

dictionary.txt 文件：

bac def ghij kl mano pqrstuv

这是您修改后的代码代码

dicfile = open('dictionary.txt', 'r') 
file1 = dicfile.read()
file1 = file1.split()

word = input('enter a word: ') 
if word in file1:
    print('true')
else:
    print('false')

输出：

测试用例 1

$ python3 test_9.py

enter a word: bac
true

测试用例 2

$ python3 test_9.py

enter a word: anyword
false

Answer 3

 def check_word(filename, word):
     with open(filename) as fin:
         if word in fin.read():
              return True
         else:
             return False

Answer 4

假设您想在文件中找到x。你可以这样做：

with open("textfile.txt") as openfile:
    for line in openfile:
        for part in line.split():
            if "x" in part:
                print part
            else:
                print false 

`

Answer 5

这是使用过程编程的一种方法

dictionary = open('dictionary.txt', 'r')  #Only read

word = input('Enter a word:\n)  #input typed on line below this

if word in dictionary:
    print('{} is in the dictionary (True)'.format(word))
else:
    print('{} is not in the dictionary (False)'.format(word))

这是另一个：

def in_file(filename, word):
    file = open(filename, 'r')
    if word in file:
        return True
    else:
        return False

word = input("Enter a word:\n")
in_file('dictionary.txt', word)

对于不区分大小写的结果，您可以使用word.lower()。希望这会有所帮助。

Answer 6

Stack Overflow 不是代码编写服务，我们只会在人们尝试做某事并卡住时尝试帮助他们，我不会给出确切的解决方案，但我会告诉你如何实现目标，休息是你的功课：

@Srikar Appalaraju 的好回答

#Sample 1 - elucidating each step but not memory efficient
lines = []
with open("C:\name\MyDocuments\numbers") as file:
    for line in file: 
        line = line.strip() #or some other preprocessing
        lines.append(line) #storing everything in memory!

#Sample 2 - a more pythonic and idiomatic way but still not memory efficient
with open("C:\name\MyDocuments\numbers") as file:
    lines = [line.strip() for line in file]

#Sample 3 - a more pythonic way with efficient memory usage. Proper usage of with and file iterators. 
with open("C:\name\MyDocuments\numbers") as file:
    for line in file:
        line = line.strip() #preprocess line
        doSomethingWithThisLine(line) #take action on line instead of storing in a list. more memory efficient at the cost of execution speed.

例子：

with open('dictionary.txt','r') as f:
    #for reading line by line
    for line in f:

        print(line)





    #reading whole file once
    print(f.read())

现在如何检查文件中的单词：

使用python'in'运算符

#checking word
if 'some_word' in line:
    print(True)
else:
    print(False)

现在尝试一些东西，当你卡住时寻求帮助，而不是要求编写代码。