How to Jump to a Line in Python

How to jump to a line in python? Jumping a line or a sentence or output has always remain a part of programming since ages. But programmers are all not aware of the different ways of doing it in output or while writing to files.

In this chapter, programmers will get detailed information on how to jump a line in python. Programmers can also learn about the ‘use file.readlines()’ and slicing. You can refer to the examples below to gain a better understanding.

How to jump to a Line in Python?

There are many ways in which you can jump a line in python. Some methods are:

if, continue, break, pass, readlines(), and slicing.

Using ‘if’ statement methods

The primary purpose of the ‘if’ statement is to control the direction of programs. Sometimes, you get certain results you might not want to execute. In those cases, we use the ‘if’ statement to jump the execution. It is a naive method and is illogical.

Code:

num = [1, 2, 3, 4]
for i in num:
    if i==3:
        print()
    print(i)

Output:

Using Continue statement method.

We use the ‘continue’ statement to jump the execution of the current iteration of the loop. To avoid error, we do not use this statement outside of it.

Code:

for val in "string":
    if val == "i":
        continue
    print(val)

print("The end")

Output:

Using the ‘break’ statement method

It ends the current loop and performs execution at the following statement. We can use this statement in both ‘while’ and the ‘for’ loop.

Code:

count = 10
while count > 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 jump, you remove that line. If not, you consider it.
In the example below, we print all the lines except the one we want to jump.

Read also: How to Calculate IRR on TI-84

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:

Using Slicing concept method

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.

Conclusion:

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

jumping to 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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