Invalid Literal for Int with Base 10
The “invalid literal for int() with base 10” error usually occurs when you are trying to convert a string value to an integer, but the string cannot be interpreted as a valid integer. This can happen for a number of reasons, including:
- The string contains non-numeric characters.
- The string is an empty string.
- The string represents a number that is too large or too small to be represented as an integer.
Here is an example of code that would trigger this error:
x = "hello"
y = int(x)
To fix this error, you’ll need to make sure that the string you are trying to convert to an integer is a valid integer representation. Here are a few ways you can do this:
- Use the
isdigit()method to check if the string contains only digits:
if x.isdigit():
y = int(x)
else:
print("The string is not a valid integer")
- Use the
tryandexceptstatements to handle the exception that is raised when the string cannot be converted to an integer:
try:
y = int(x)
except ValueError:
print("The string is not a valid integer")
- Use regular expressions to check if the string is a valid integer representation:
import re
if re.match(r'^-?\d+$', x):
y = int(x)
else:
print("The string is not a valid integer")
Here are a few more examples of how you can use the techniques I mentioned to handle the “invalid literal for int() with base 10” error:
Example 1: Use the isdigit() method to check if the string contains only digits:
x = "12345"
if x.isdigit():
y = int(x)
print(y) # 12345
else:
print("The string is not a valid integer")
x = "12345hello"
if x.isdigit():
y = int(x)
print(y)
else:
print("The string is not a valid integer") # The string is not a valid integer
Example 2: Use the try and except statements to handle the exception that is raised when the string cannot be converted to an integer:
x = "12345"
try:
y = int(x)
print(y) # 12345
except ValueError:
print("The string is not a valid integer")
x = "12345hello"
try:
y = int(x)
print(y)
except ValueError:
print("The string is not a valid integer") # The string is not a valid integer
Example 3: Use regular expressions to check if the string is a valid integer representation:
import re
x = "12345"
if re.match(r'^-?\d+$', x):
y = int(x)
print(y) # 12345
else:
print("The string is not a valid integer")
x = "12345hello"
if re.match(r'^-?\d+$', x):
y = int(x)
print(y)
else:
print("The string is not a valid integer") # The string is not a valid integer
