So I'm pretty stumped on how to convert a string into an int using the try/except function. Does anyone know a simple function on how to do this? I feel like I'm still a little hazy on string and ints. I'm pretty confident that ints are related to numbers. Strings...not so much.
This question is related to
python
python-3.x
You can do :
try :
string_integer = int(string)
except ValueError :
print("This string doesn't contain an integer")
Here it is:
s = "123"
try:
i = int(s)
except ValueError as verr:
pass # do job to handle: s does not contain anything convertible to int
except Exception as ex:
pass # do job to handle: Exception occurred while converting to int
Firstly, try
/ except
are not functions, but statements.
To convert a string (or any other type that can be converted) to an integer in Python, simply call the int()
built-in function. int()
will raise
a ValueError
if it fails and you should catch this specifically:
>>> for value in '12345', 67890, 3.14, 42L, 0b010101, 0xFE, 'Not convertible':
... try:
... print '%s as an int is %d' % (str(value), int(value))
... except ValueError as ex:
... print '"%s" cannot be converted to an int: %s' % (value, ex)
...
12345 as an int is 12345
67890 as an int is 67890
3.14 as an int is 3
42 as an int is 42
21 as an int is 21
254 as an int is 254
"Not convertible" cannot be converted to an int: invalid literal for int() with base 10: 'Not convertible'
the syntax has changed slightly:
>>> for value in '12345', 67890, 3.14, 42, 0b010101, 0xFE, 'Not convertible':
... try:
... print('%s as an int is %d' % (str(value), int(value)))
... except ValueError as ex:
... print('"%s" cannot be converted to an int: %s' % (value, ex))
...
12345 as an int is 12345
67890 as an int is 67890
3.14 as an int is 3
42 as an int is 42
21 as an int is 21
254 as an int is 254
"Not convertible" cannot be converted to an int: invalid literal for int() with base 10: 'Not convertible'
It is important to be specific about what exception you're trying to catch when using a try/except block.
string = "abcd"
try:
string_int = int(string)
print(string_int)
except ValueError:
# Handle the exception
print('Please enter an integer')
Try/Excepts are powerful because if something can fail in a number of different ways, you can specify how you want the program to react in each fail case.
Source: Stackoverflow.com