2.4 KiB
2.4 KiB
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Converting Integer to String in Python |
Converting Integer to String in Python
Unlike many other languages out there, Python does not implicitly typecast integers (or floats) to strings when concatenating with strings. Fortunately, Python has a handy built-in function str()
which will convert the argument passed in to a string format.
The Wrong Way
Programmers coming from other languages may attempt to do the following string concatenation which produces 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 to be concatenated.
The Correct Way
Simple concatenation example:
age = 18
print("Hello, I am " + str(age) + " years old")
# Output
# Hello, I am 18 years old
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
Line by Line explanation of the above code
- First, a variable 'result' is assigned to an empty string.
- 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, the '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'.