Ways to concatenate boolean to string - Python

Concatenating a boolean to a string in Python involves converting the boolean value (True or False) into a string format and then combining it with other string elements. For example, given s = "Facts are" and v = True, the expected output after concatenation is "Facts are True". Let's explore different ways to achieve this.

Using f-strings

f-strings provide a concise and efficient way to format strings using {} placeholders. They allow embedding expressions directly into string literals with an f prefix. This method is faster and more readable compared to older formatting techniques.

s = "Facts are"
v = True

res = f"{s} {v}"
print(res)

Facts are True

Explanation: f"{s} {v}" uses an f-string to create a formatted string by embedding the values of s and v. The placeholders {s} and {v} are replaced with "Facts are" and True, respectively.

Using str()

str() function explicitly converts non-string data types, including booleans, into string format. It is commonly used with the + operator to concatenate values. This method is simple and works in all Python versions but requires explicit type conversion.

s = "Facts are"
v = True

res = s + " " + str(v)
print(res)

Facts are True

Explanation: s + " " + str(v) concatenates the string s, a space " ", and the string representation of v using the str() function. The str(v) converts the boolean True into the string "True", ensuring proper concatenation.

Using % formatting

The % formatting method uses format specifiers like %s (string), %d (integer), and %f (float) to insert values into a string. This method is still supported but is less flexible and readable compared to modern alternatives like f-strings or .format().

v = True
res = "Facts are %s" % v

print(res)

Facts are True

Explanation: The %s acts as a placeholder for a string and % v replaces it with the value of v, which is True. This results in the final string "Facts are True", which is stored in res.

Using format()

format() allows string formatting using {} placeholders. It provides more flexibility than % formatting by supporting positional and keyword arguments.

s = "Facts are"
v = True

res = "{} {}".format(s, v)
print(res)

Facts are True

Explanation: format() method to insert the values of s and v into the string. The {} placeholders are replaced sequentially by s, which is "Facts are" and v, which is True.