Python add line to list

Add String to a List in Python

How to add a string or multiple strings to a list in Python? Adding a string to a list is a widespread usage of list operation and it can be done in several ways. For example, you can use the + operator, append() , insert() , extend() , and list comprehension . In this article, I will explain adding string to a list in python by using all these methods with examples.

Below are methods to add or append a string to a list in python:

• Append String at the end of a list.
• Add an element at a specific index in a list.
• Add elements from the list to the end of the list.
• Use + operator to concatenate two string lists together.
• Use list comprehension to add string elements to a list.

1. Quick Examples of Adding String to a List

If you are in a hurry, below are some quick examples of adding a string to a list.

 # Below are the quick examples # Example 1: Add string to list at the end # Using append() function technology = ['Spark','Python','Pyspark'] technology.append('Java') # Example 2: Add list with string to the list # Using append() function technology1 = ['Hyperion', 'Pandas', 'Pyspark'] technology.append(technology1) # Example 3: Add string at specific position # Using insert() function technology.insert(0, 'Hadoop') # Example 4: Add string list by extending elements # Using extend() function technology1 = ['Pandas', 'Pyspark'] technology.extend(technology1) # Example 5: Use the + operator technology += technology1 # Example 6: Using list comprehension result = technology + [x for x in technology1] 

2. Add String to List at the End

By using append() you can add a string at the end of the list in Python. This method takes the string as an argument and adds the string to the existing list, this does not return any value. For example, lets take list called technology and add the string Java using the following code.

 # Consider list of strings technology = ['Spark','Python','Pyspark'] print("Actual List",technology) # Add string to the list technology.append('Java') print("Updated List: ",technology) 

This example yields the below output.

Similarly, you can also use the append() to add a list of strings to a list in Python. For example, create a list technology1 and add it to the list technology . Now technology contains the elements of the original list and the list you added.

 # Create two lists technology = ['Java', 'Spark', 'Python'] technology1 = ['Hyperion', 'Pandas', 'Pyspark'] print("Original List 1: ",technology) print("Original List 2: ",technology1) # Add list and an element to list using append() technology.append(technology1) print("Updated List 1: ",technology) 

This example yields the below output. Notice that the list is added as a single element resulting nested list.

3. Add String at a Specific Position

You can use the insert() to add a string at a specific index position in the python list. This takes two parameter, first the index where you watend to add and the string value to be added. Lets add string ‘Hadoop’ at the first position on the list. For more examples refer to add element to list by index.

 # Add string at a specific position technology = ['Spark','Python','Pyspark'] # Insert first position technology.insert(0, 'Hadoop') print(technology) # Output: # ['Hadoop', 'Spark', 'Python', 'Pyspark'] # Insert second position technology = ['Spark','Python','Pyspark'] technology.insert(1, 'Hyperion') print(technology) # Output: # ['Spark', 'Hyperion', 'Python', 'Pyspark'] 

4. Add Multiple Strings to the List

The extend() adds multiple strings to the existing list at the end. When you add an iterator with stirngs by using this method, it actually extends the strings as separate string and adds them to the list. Note that this modifies the existing list with the new strings and the strings are added at the end of the original list. For more examples refer to append multiple elements to the list.

 # Add Multiple Strings to the List technology = ['Spark', 'Python'] technology1 = ['Pandas', 'Pyspark'] # Extend list to list technology.extend(technology1) print(technology) # Output: # ['Spark', 'Python', 'Pandas', 'Pyspark'] 

Let’s add string from the tuple to insert into the list. Here, my list had 2 strings to start with, and added a tuple of 3 stirng, after adding a tuple, there are 5 string in the list.

 # Consider the list of strings technology = ['Spark', 'Python'] print("Actual List: ",technology) # Extend tuple to list technology.extend(('Java','Pandas','Pyspark')) print("Final List: ",technology) # Output: # Actual List: ['Spark', 'Python'] # Final List: ['Spark', 'Python', 'Java', 'Pandas', 'Pyspark'] 

5. Add String to List Using + Operator

You can also use the «+» operator to concatenate two lists together. For example,

 # Use the += operator technology = ['Spark', 'Python'] technology1 = ['Pandas', 'Pyspark'] technology += technology1 print(technology) # Output: # ['Spark', 'Python', 'Pandas', 'Pyspark'] 

6. Using List Comprehension

You can use list comprehension to add a string to a list based on a certain condition or operation. For example,

 # Using list comprehension result = technology + [x for x in technology1] print(result) 

Conclusion

This article explained how to add or append a string at the end of a Python list, add a string at a specific index in a list, and add multiple stirngs from the list at the end. Also explained using + operator to concatenate two string lists together and finally using the list comprehension .

You may also like reading:

Источник

Add string to list Python + Examples

Let’s see how to add string to list python.

Adding a string to a list inserts the string as a single element, and the element will be added to the list at the end. The list.append() will append it to the end of the list.

l1 = ["One", "Two", "Three"] l1.append("Four") print(l1)

You can refer to the below screenshot to see the output for add string to list python.

Append string to list python

Here, we will see how to concatenate string to list python.

In this example, we will first convert the string into a Python list and then will perform the task to append the string to the list using the + operator.

list1 = [101, 103] str1 = 'aabb' list1 += [str1] print("The list is : " + str(list1))

You can refer to the below screenshot to see the output for append string to list python.

The above code we can use to append string to list in python.

Insert string to list python

Now, we will see how to insert string to list python.

To insert a string to the list we have used list1.insert() to add the value with a specified position in the list.

list1 = ['aaa', 'bbb'] list1.insert(2, 'ccc') print (list1)

You can refer to the below screenshot to see the output for insert string to list python.

The above Python code we can use to insert string to list in python.

Join string to list python

Let’s see how to join string to list python.

To join string to list we will use join method on the string and it will join all the elements present in the list.

list = ['aaa', 'bbb', 'ccc'] str = ','.join(list) print(str)

You can refer to the below screenshot to see the output for join string to list python

Add string to empty list python

Let see how to add string to empty list python.

In this example, we will add string element to empty list by using the append method in python.

my_list = [] my_list.append("abc") print(my_list)

You can refer to the below screenshot to see the output for add string to empty list python.

Add multiple strings to list python

Now, we will see how to add multiple strings to list python.

To add multiple strings to list python we will use the append method to add multiple strings to list python.

l = [1, 2, 3, 4, 5] l.append("e") l.append("f") print(l)

You can refer to the below screenshot to see the output for add multiple strings to list python

Add string to the beginning of list python

Now, we will see how to add string to the beginning of list python.

To add a string to the beginning of the list we have used list1.insert() to add the value in the list.

list1 = [101, 102] list1.insert(0, 'aaa') print (list1)

You can refer to the below screenshot to see the output to add string to the beginning of list python.

Append the string to empty list python

Let’s see how to append the string to empty list python.

In this example, we will append the string to empty list by using the append method in python.

list1 = [] list1.append("Python") print(list1)

You can refer to the below screenshot to see the output append the string to empty list python.

Insert the string at the beginning of all items in a list python

Here, we will see how to insert the string at the beginning of all items in a list python.

In this example, we will use for loop to insert the string at the beginning of all items present in a list.

my_list = [11, 12, 13, 14] print(['Pythonguides'.format(i) for i in my_list])

You can refer to the below screenshot to see the output for insert the string at the beginning of all items in a list python

Add string to end of list python

Here, we will see how to add string to end of list python.

To add string to end of the list python we will first convert the string into the list and then will perform the task to add the string to the list using the + operator.

list1 = [10, 11] str1 = 'Python' list1 += [str1] print("The list is : " + str(list1))

You can refer to the below screenshot to see the output for how to add string to end of list python

Python add string to list if not present

Now, we will see python add string to list if not present.

In this example, we have to add the string to the list if not present using the append method in python.

val = [1, 2] val.append("three") print (val)

You can refer to the below screenshot to see the output for python add string to list if not present.

Python append string to list without split

Let’s see python append string to list without split.

In this example, we will use + operator to append string to list without split in python.

list1 = ['to', 'Pythonguides'] list1 = ['Welcome'] + list1 print (list1)

You can refer to the below screenshot to see the output for python append string to list without split

Append string to beginning of list python

Here, we will see how to append string to beginning of list python

To append string to beginning of list we have used [a] + l1 and the string will get appended to the list at the beginning.

a = "Python" l1 = [1, 2, 3] res = [a] + l1 print(res)

You can refer to the below screenshot to see the output for append string to beginning of list python.

You may like the following Python list tutorials:

In this Python tutorial, we have learned about how to Add string to list python. Also, we covered these below topics:

• How to add string to list python
• Append string to list python
• How to Insert string to list python
• Join string to list python
• How to add string to empty list python
• Add multiple strings to list python
• How to add string to the beginning of list python
• Append string to empty list python
• Insert the string at the beginning of all items in a list python
• How to add string to end of list python
• Python add string to list if not present
• Python append string to list without split
• Append string to beginning of list python

I am Bijay Kumar, a Microsoft MVP in SharePoint. Apart from SharePoint, I started working on Python, Machine learning, and artificial intelligence for the last 5 years. During this time I got expertise in various Python libraries also like Tkinter, Pandas, NumPy, Turtle, Django, Matplotlib, Tensorflow, Scipy, Scikit-Learn, etc… for various clients in the United States, Canada, the United Kingdom, Australia, New Zealand, etc. Check out my profile.

Источник

8 ways to add an element to the beginning of a list and string in Python

Let’s look at different methods for adding elements to the beginning of a list and string: concatenation, insert, append, extend, rjust, and f-strings.

How to add an item to the top of a Python list: 4 methods

Lists in Python are mutable and ordered data structures designed to store a group of values. If you need to insert an element in the first position of an existing list during the program execution, you can use one of the methods described below.

Method 1: insert

This method is implemented using the built-in insert() method of lists. This method works with any type of data and allows you to insert the desired element at any position in the existing list, including the first one. The insert() method takes two parameters – the index (position) at which the element is to be inserted, and the element itself. Counting positions in Python starts from zero – Accordingly, to insert an element at the beginning of the list , you need to specify 0 , and not, as the first parameter 1 . Let’s take an example. Suppose we have a list [1, 2, 3] where we want to insert the number 5 at the beginning. Use the insert() method:

arr = [1, 2, 3] arr.insert(0, 5) print(arr) 

Источник