如何使用Python获取给定单词所在的行号？

要从存在给定单词的文件中获取行号，请创建一个列表，其中每个索引都包含每行的内容。为此，请按照以下说明进行操作。

首先，我们需要一个文件来读取。因此，使用下面的魔法函数在 Jupiter notebook 中创建一个文件：

%%writefile geeks.txt 
Hello, I am Romy 
I am a content writer at GfG 
Nice to meet you 
Hello, hii all fine

或者您可以使用任何.txt 文件。

Python3

# READ FILE
df = open("geeks.txt")
 
# read file
read = df.read()
 
# return cursor to
# the beginning
# of the file.
df.seek(0)
read

Python3

# create empty list
arr = []
 
# count number of
# lines in the file
line = 1
for word in read:
    if word == '\n':
        line += 1
print("Number of lines in file is: ", line)
 
for i in range(line):
    # readline() method,
    # reads one line at
    # a time
    arr.append(df.readline())

Python3

# Function that will return
# line in which word is present
def findline(word):
    for i in range(len(arr)):
        if word in arr[i]:
            print(i+1, end=", ")
 
 
findline("Hello")

输出：

'Hello, I am Romy\nI am a content writer at GfG\nNice to meet you\nHello, hii all fine'

Python3

# create empty list
arr = []
 
# count number of
# lines in the file
line = 1
for word in read:
    if word == '\n':
        line += 1
print("Number of lines in file is: ", line)
 
for i in range(line):
    # readline() method,
    # reads one line at
    # a time
    arr.append(df.readline())

输出：

Number of lines in file is: 4
['Hello, I am Romy\n',
'I am a content writer at GfG\n', 
'Nice to meet you\n',
'Hello, hii all fine']

Python3

# Function that will return
# line in which word is present
def findline(word):
    for i in range(len(arr)):
        if word in arr[i]:
            print(i+1, end=", ")
 
 
findline("Hello")

输出：

1, 4
Hello is present in 1st and 4th line.