Unlike many other programming languages out there, Python does not implicitly typecast integers (or floats) to strings when you concatenate them to strings.
Fortunately, Python has a handy built-in function
str() which will convert the argument passed in to a string format.
The Wrong Way to Convert a String to an Integer in Python
Programmers coming from other programming languages may attempt to do the following string concatenation, which will produce an error:
age = 18 string = "Hello, I am " + age + " years old"
The error that shows up is:
Traceback (most recent call last): File "python", line 3, in <module> TypeError: must be str, not int
TypeError: must be str, not int indicates that the integer must first be converted to a string before it can be concatenated.
The Correct Way to Convert a String to an Integer in Python
Here's a simple concatenation example:
age = 18 print("Hello, I am " + str(age) + " years old") # Output # Hello, I am 18 years old
Here's how to print
1 2 3 4 5 6 7 8 9 10 using a single string:
result = "" for i in range(1, 11): result += str(i) + " " print(result) # Output # 1 2 3 4 5 6 7 8 9 10
Here's a line-by-Line explanation of how the above code works:
- First of all a variable ‘result’ is assigned to an empty string.
- The for loop is being used to iterate over a list of numbers.
- This list of numbers is generated using the range function.
- so range(1,11) is going to generate a list of numbers from 1 to 10.
- On each for loop iteration this ‘i’ variable is going to take up values from 1 to 10.
- On first iteration when the variable i=1,then the variable [result=result+str(i)+“(space character)”],str(i) converts the ‘i’ which is an integer value to a string value.
- Since i=1, on the first iteration finally result=1.
- And the same process goes on until i=10 and finally after the last iteration result=1 2 3 4 5 6 7 8 9 10.
- Therefore when we finally print the result after the for loop the output on the console is ‘1 2 3 4 5 6 7 8 9 10’.
I hope you've found this helpful. Happy coding.