Solve Python error: TypeError: unsupported operand type(s) for +: 'str' and 'int'

Solution to Python error: TypeError: unsupported operand type(s) for : 'str' and 'int'

We often encounter this when writing programs in Python All kinds of errors. One of the common errors is "TypeError: unsupported operand type(s) for : 'str' and 'int'". This error is usually caused by incorrect operations between string types and integer types.

The reason for this error is that in Python, strings (str) and integers (int) are different data types, and their operations cannot be mixed. When we try to add a string and an integer, Python will throw a type error, indicating that operations between string and integer types are not supported.

In order to better understand this error, let's look at a code example:

name = "Alice"
age = 25
message = "My name is " + name + " and I am " + age + " years old."
print(message)

When you run this code, "TypeError: unsupported operand type(s) for : 'str' will appear and 'int'" error.

To solve this error, we need to convert the integer type variable to the string type and then perform the addition operation. In Python, there are several ways to convert an integer to a string. The following are some commonly used methods:

1. Use str() function for type conversion

name = "Alice"
age = 25
message = "My name is " + name + " and I am " + str(age) + " years old."
print(message)

This code uses the str() function to convert the integer type variable age Convert it to a string. Then the string is added to other strings and finally the correct result is obtained.

2. Use the format() method for formatting

name = "Alice"
age = 25
message = "My name is {} and I am {} years old.".format(name, age)
print(message)

Using the format() method can more conveniently perform string formatting operations. In this example, we use {} as placeholder, and then pass in the variables name and age in the format() method, which will replace the placeholder in order to get the final string.

3. Use f-string for formatting (Python 3.6 and above)

name = "Alice"
age = 25
message = f"My name is {name} and I am {age} years old."
print(message)

f-string is a new character introduced in Python 3.6 and above String formatting method. In f-string, we can use curly braces {} directly in the string to refer to variables and add an f character before the variable. In this way, the variable will be automatically converted to a string and replaced into the corresponding curly braces.

Through the above three methods, we can solve the "TypeError: unsupported operand type(s) for : 'str' and 'int'" error. Because in this error we involve the addition operation of strings and integers, we need to convert the integer type variable to the string type so that the operation can be performed.

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