How do you skip a line 1 in python?

In this article will see how to skip a line in a file in Python. There are multiple ways to do that. In this post, we will discuss two approaches.

1. Using the readlines[] method

The readlines[] method reads a file and returns a list. Here, each item of a list contains a line of the file, i.e., list[0] will have the first line, list[1] the second line, and so on.

Since it is a list, we can iterate over it. When the current line number is equal to the line number that we want to skip, we omit that line. Otherwise, we consider it.

Consider the following example in which we print all lines, except the one that we want to skip.

def skipLine[f, skip]:
  lines = f.readlines[]
  skip = skip - 1 #index of the list starts from 0

  for line_no, line in enumerate[lines]:
    if line_no==skip:
      pass
    else:
      print[line, end=""]

Let’s try out the above code by skipping the first line of the sample.txt file.

sample.txt

This is a sample file.
Python is a very powerful programming language.
Let's see how to skip a line in Python.
It is very easy.
I love Python. It makes everything so fun.

try:
  f = open["sample.txt", "r"]
  skipLine[f, 1] 
finally:
  f.close[]

Output

Python is a very powerful programming language.
Let's see how to skip a line in Python.
It is very easy.
I love Python. It makes everything so fun.

Let’s now skip the 3rd line.

try:
  f = open["sample.txt", "r"]
  skipLine[f, 3] 
finally:
  f.close[]

Output

This is a sample file.
Python is a very powerful programming language.
It is very easy.
I love Python. It makes everything so fun.

If you pass a value that is greater than the total number of lines or less than 1, then nothing will happen.

2. Using the readlines[] method and List Slicing

Since the readlines[] method returns a list, we can perform slicing to skip a specific line. Consider the following example.

def skipLineSlicing[f, skip]:
  skip -= 1 #index of list starts from 0
  if skip  0:
    print[count]
    if count == 5:
       break
    count -= 1

Output:

Using Pass statement

When we don't want to execute any command or code, and when the statement is required syntactically, we use this statement.

Code:

s = "Gaurav"
  
for i in s:
        pass
  
def fun[]:
    pass
  
fun[]
  
for i in s:
    if i == 'v':
        print['Pass executed']
        pass
    print[i]

Output:

Using readlines[] method

The primary function of the readlines[] method is to read a file and then return a list. Since this function returns the list, we can repeat it. If the line number you are currently on is equal to the line number you wish to skip, you remove that line. If not, you consider it.
In the example below, we print all the lines except the one we want to skip.

Code:

def skipLine[f, skip]:
  lines = f.readlines[]
  skip = skip - 1 

  for line_no, line in enumerate[lines]:
    if line_no==skip:
      pass
    else:
      print[line, end=""]

Output:

We can skip the first line and write the same program as follows:

Program:

try:
  f = open["sample.txt", "r"]
  skipLine[f, 1] 
finally:
  f.close[]

Output:

The readlines[] method is very efficient, and we use it generally. You can even use the readlines[] along with list slicing. Slicing does not skip a line. But when we use it with list slicing, it does the job. You can get an explanation on Slicing and List Slicing below.

Using Slicing concept

We use this method to create a substring from a given string. When we have to slice a sequence, a slice object helps. It also helps to identify where to start and end a slicing. It generally takes three parameters:

1. Start
2. Stop
3. Step

Step parameter helps to enumerate the steps required from start to end index.

Syntax:

sliceobject = slice[start, stop, step]

List Slicing

As we have already noticed, the readlines[] method returns a list. It is the reason why we can use slicing to skip a line.

Code:

def skipLineSlicing[f, skip]:
  skip -= 1 
  if skip < 0:
    skip= 1
  lines = f.readlines[]
  lines = lines[0:skip] + lines[skip+1:len[lines]]
  for line in lines:
    print[line, end=""]

Output:

We can also write this code by skipping the last line. It is a sample.txt file.

Code:

try:
  f = open["sample.txt", "r"]
  skipLineSlicing[f, 5] 
finally:
  f.close[]

Output:

Conclusion:

Here we have learned some of the best ways to skip a line. One of the best methods is the readlines[] method for files and for skipping any specific code output or create a gap, pass or if-print[] combination are the best and the most efficient ones. Skipping lines or output also helps in symmetrically design or print output in many apps and pattern-based systems.

Skipping a line or a result also works in software like duplicate finder, duplicate checker, plagiarism tools, etc. However, there are other methods as well that we can use.

List slicing is one of the best methods because it can bring customization is slicing but less efficient as it requires more variables and objects which increase space complexity.

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