Join The Keys Of A Dictionary Into A String In Python

If you are looking for a tutorial to join the keys of a dictionary into a string in Python, keep reading our article. We will show you how to get keys’ values in a dictionary and combine them into a string through detailed explanations and code implementations.

Get the keys’ value of a dictionary

Firstly, you must get their values to join the keys of a dictionary into a string. We will introduce to you some ways to get keys in a dictionary. 

The most common way to get keys in a dictionary is to traverse the dictionary. Because the key is represented for the positions of the values (similar to indexes in the array type), you can use the for loop, and the returned result is the keys’ values. 

Code:

myDict = {"Key1": "Value1", "Key2": "Value2", "Key3": "Value3"}

for key in myDict:
  print(key)

Result:

Key1
Key2
Key3

You can also access through items attribute

Code:

myDict = {"Key1": "Value1", "Key2": "Value2", "Key3": "Value3"}

for key, value in myDict.items():
  print(key)

Result:

Key1
Key2
Key3

Or you can access the keys by the keys() function.

Code:

myDict = {"Key1": "Value1", "Key2": "Value2", "Key3": "Value3"}
 
for key in myDict.keys():
  print(key)

Result:

Key1
Key2
Key3

Join the keys of a dictionary into a string in Python

Using the operator “+”

The + operator can concatenate strings. The later string lengthens the first string.

Code:

myDict = {"Key1": "Value1", "Key2": "Value2", "Key3": "Value3"}
myString = ""
 
for key, value in myDict.items():
  myString += key
  myString += " "
  
print("My joined-keys string is:",myString)

Result:

My joined-keys string is: Key1 Key2 Key3 

Using __add__ method

__add__ is a beneficial method. You can easily add the attributes of a class instance together. For example, Class X and Class y have two objects, ob1 and ob2, respectively. Both of them have the same attribute called a. By using the __add__ method, the attributes of the instances are added like ob1.a + ob2.a.

Code:

myDict = {"Key1": "Value1", "Key2": "Value2", "Key3": "Value3"}
myString = ""
 
for key, value in myDict.items():
  myString = myString.__add__(key)
  myString += " "
  
print("My joined-keys string is:",myString)

Result:

My joined-keys string is: Key1 Key2 Key3 

Using join() function

The function merges all the sub-string in the parameter into one string and separates them by a predefined string. The sub-string can be the elements of a list, array or something else that can be iterable.

Syntax: 

“predefine_string”.join(sub_strings)

Code:

myDict = {"Key1": "Value1", "Key2": "Value2", "Key3": "Value3"}
myString = " " 
myString = myString.join(myDict)
 
print("My joined-keys string is:", myString)

Result:

My joined-keys string is: Key1 Key2 Key3

Summary

Our tutorial has explained how to join the keys of a dictionary into a string in Python. We hope our article can help you solve the problem. If you have any questions, please leave us your comments. Thanks for reading!

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Robert Collier

My name is Robert Collier. I graduated in IT at HUST university. My interest is learning programming languages; my strengths are Python, C, C++, and Machine Learning/Deep Learning/NLP. I will share all the knowledge I have through my articles. Hope you like them.

Name of the university: HUST
Major: IT
Programming Languages: Python, C, C++, Machine Learning/Deep Learning/NLP