Prepend to string python

Python Append to String – How is it done?

Here are the 4 ways to append a string in Python:

1. Using += operator: The += operator appends a string to another.
2. Using String join(): It returns the string concatenated with the elements of an iterable.
3. Using f-string: It is a comprehensive new way to format strings.
4. Using custom function: You can create your own function to append to a string.

Method 1: Use the += operator

To append a string to another string in Python, you can use the “+=operator”. The += operator creates a new string by combining the original and additional text. It adds two values together and assigns the final value to a variable.

A new string is created using +=(plus equal operator) to concatenate two strings, and the original string won’t change.

Example

fname = "Millie" mname = "Bobby" # printing fname string print("The first name: " + str(fname)) # printing mname add string print("The middle name : " + str(mname)) # Using += operator adding one string to another fname += mname # print result print("The concatenated string is: " + fname

The first name: Millie The middle name : Bobby The concatenated string is: MillieBobby

Appending a string multiple times in Python

To append a string multiple times in Python, use the while loop with the += operator. Then, create a user-defined function to append the string n times to the original string.

str = 'Millie' def string_append(s, n): op = '' i = 0 while i < n: op += s + '-' i = i + 1 return op jstring = string_append(str, 5) print(jstring)

Millie-Millie-Millie-Millie-Millie-

Method 2: Using the String join() method

To append a string in Python, use the string.join() method. First, create a list, append the strings to it, and use the string join() function to merge them to get the final string.

Example

fname = "Millie" mname = "Bobby" # printing fname string print("The first name: " + str(fname)) # printing mname add string print("The middle name : " + str(mname)) # Create a list of Strings listOfStrings = [fname, mname] finalString = "".join(listOfStrings) # print the final result print("The appended string is: " + finalString)

The first name: Millie The middle name : Bobby The appended string is: MillieBobby

Method 3: Use f-strings

As of the 3.6 version, Python f-strings is a comprehensive new way to format strings. Not only are they more readable, but they are also more concise and less prone to error than other ways of formatting, and also they are faster! You can also concate the strings using f-strings.

Example

fname = "Millie" mname = "Bobby" # printing fname string print("The first name: " + str(fname)) # printing mname add string print("The middle name : " + str(mname)) # use f-strings to concat the strings. finalString = f"" # print result print("The appended string is: " + finalString) 

The first name: Millie The middle name : Bobby The appended string is: MillieBobby

In this example, it looks like we are formatting two strings using an f-string, but we are concatenating two strings.

Method 4: Using a custom function

str = 'Krunal' def string_append(s, n): op = ' ' i = 0 while i < n: op += s + '-' i = i + 1 return op jstring = string_append(str, 5) print(jstring) 

 Krunal-Krunal-Krunal-Krunal-Krunal-

Источник

Append to a string Python + Examples

Let’s see how to append to a string python.

In this example, we will use “+” operator to append to a string in python. The code below shows appending of two string.

s1 = "New" s2 = "Delhi" space = " " print(s1 + space + s2)

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

This is how we can append to a string in Python.

Prepend to a string python

Now, we will see how to prepend to a string python.

Prepend to a string will add the element to a string. In this example, we have two strings and to get the output we will print my_string.

my_string = "Python" add_string = " is famous" my_string += add_string print("The string is : " + my_string)

You can refer to the below screenshot to see the output for prepend to a string python

This is how we can prepend a string in Python.

Insert to a string python

Here, we will see how to insert to a string python.

• To insert into a string we will use indexing in python.
• Inserting into a string returns the string with another string inserted into it at a given index.
• In this example, we are inserting “New York” into “Los Angeles, Chicago” and it returns “Los Angeles, New York, Chicago”.

str1 = "Los Angeles, Chicago" str2 = "New York, " beg_substr = str1[:7] end_substr = str1[7:] my_str = beg_substr + str2 + end_substr print(my_str)

This is how we can insert to a sting in Python.

Append 0 to a string python

Let’s see how to append 0 to a string python.

In this example, we will use rjust function for appending 0 to a string as it offers a single line way to perform the task.

t_str = 'New' N = 1 res = t_str.rjust(N + len(t_str), '0') print("The string after adding zeros : " + str(res))

You can refer to the below screenshot to see the output for append 0 to a string python.

The above Python code we can use to append 0 to a string in Python.

Append character to a string python

Now, we will see how to append character to a string python.

• To append a character to a string we will insert the character at an index of a string and it will create a new string with that character.
• To insert a character we will use slicing a_str[:1] + “n” + a_str[1:] and the “+” operator is used to insert the desired character.

a_str = "Hello" a_str = a_str[:1] + "n" + a_str[1:] print(a_str)

You can refer to the below screenshot to see the output for append character to a string python

This is how to append character to a string in Python.

Python append to beginning of a string in a loop

Here, we will see Python append to the beginning of a string in a loop

In this example, we will append to the beginning of a string using the for loop, and the “+” operator is used.

endstr = "People" my_list = ['Hello', 'to', 'all'] for words in my_list: endstr = endstr + words print("The string is: " + endstr)

You can refer to the below screenshot to see the output for python add to string in a loop.

The above code, we can use to append to beginning of a string in a loop in Python.

Add letter to a string python

Here, we will see how to add letter to a string python.

To add letter to a string python we will use f”” and to get the output we will print(res).

str1 = "Python" l2 = "G" res = f"" print(res)

You can refer to the below screenshot to see the output for add letter to a string python

This is python code to add letter to a string in Python.

Add variable to a string python

Let’s see how to add variable to a string python.

In this example, we will use “+” operator to add a variable to a string.

var = "Guides" print("Python " + var + " for learning")

You can refer to the below screenshot to see the output for add variable to a string python

This is how to add variable to a string in Python.

Add int to a string python

Now, we will see how to add int to a string python.

Firstly, we will initialize the string and a number and by using the type conversion we will insert the number in the string, and then to get the output we will print.

t_str = "Python" t_int = 8 res = t_str + str(t_int) + t_str print("After adding number is : " + str(res))

You can refer to the below screenshot to see the output for add int to a string python

This is how to add int to a string in Python.

Append to end of a string in python

Here, we will see how to append to the end of a string in python

In this example, we will use the “+” operator, and to get the output we will print(string3).

string1 = "Hello Wo" string2 = "rld" string3 = string1 + string2 print(string3)

You can refer to the below screenshot to see the output for append to the end of a string in python.

The above code we can use to append to end of a string in python.

How to append a new line to a string in python

Let us see how to append a new line to a string in python

In this example, to append a new line to a string we have specified the newline character by using “\n” which is also called an escape character. Hence, the string “to python” is printed in the next line.

my_string = "Welcome\n to python." print(my_string)

You can refer to the below screenshot to see the output for how to append a new line to a string in python.

The above code we can use to append a new line to a string in python.

How to append backslash to a string in python

Now, we will see how to append backslash to a string in python

In this example, to append backslash to a string in python we have used the syntax “\\” to represent single backslash to a string.

my_str1 = "Hello" my_str2 = "\\" res = my_str1 + my_str2 print(res)

You can refer to the below screenshot to see the output for how to append backslash to a string in python.

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

How to append to an empty string in python

Let’s see how to append to an empty string in python.

To append to an empty string in python we have to use “+” operator to append in a empty string.

str = "" res = str + "Hello World" print(res)

You can refer to the below screenshot to see the output for how to append to an empty string in python.

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

How to append double quotes to a string in python

Here, we will see how to append double quotes to a string in python.

To append double quotes to a string in python we have to put the string in the single quotes.

double_quotes = '"Python"' print(double_quotes)

You can refer to the below screenshot to see the output for how to append double quotes to a string in python.

The above code we can use to append double quotes to a string in python.

How to append to a string in python

In python, to append a string in python we will use the ” + ” operator and it will append the variable to the existing string.

name = 'Misheil' salary = 10000 print('My name is ' + name + 'and my salary is around' + str(salary))

After writing the above Python code (how to append to a string in python), Ones you will print then the output will appear ” My name is Misheil and my salary is around 10000 “. Here, the ” + ” operator is used to append the variable. Also, you can refer to the below screenshot append to a string in python.

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

• Append to a string python
• Prepend to a string python
• Insert to a string python
• Append 0 to a string python
• Append character to a string python
• Python append to the beginning of a string in a loop
• Add letter to a string python
• Add variable to a string python
• Add int to a string python
• Append to the end of a string in python
• How to append a new line to a string in python
• How to append backslash to a string in python
• How to append to an empty string in python
• How to append double quotes to a string in python
• How to append to a string in 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