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This same exception will even be raised if a valid float string is passed: ValueError: invalid literal for int() with base 10: '23a' If there are any non-numeric characters in your string then int() will raise an exception: > x = "23a" > z = int(x) This works as expected when you're passing a string-representation of an integer to int(), but you'll run in to trouble if the string you pass doesn't contain an integer value. Just pass the string as an argument: > x = "23" > y = "20" > z = int(x) - int(y) If you want to convert a string to an integer, the simplest way would be to use int() function. Before Python 3, the top boundary was 2 31-1 for 32-bit runtimes and 2 63-1 for 64-bit runtimes.įloats have unlimited length as well, but a floating-point number must contain a decimal point.Ĭomplex numerics must have an imaginary part, which is denoted using j: > integerFirst = 23 > floatFirst = 23.23 > complextFirst = 1 + 23j Converting Strings to Numerics Using the int() Function Since Python 3, integers are unbounded and can practically hold any number. Integers can be a positive or negative whole number. Strings in Python are really just arrays with a Unicode for each character as an element in the array, allowing you to use indices to access a single character from the string.įor example, we can access individual characters of these strings by specifying an index: > stringFirst = "Hello World!" > stringSecond = 'Again!' > stringFirstĪ numeric in Python can be an integer, a float, or a complex. String literals in Python are declared by surrounding a character with double (") or single quotation (') marks. Note: For simplicity of running and showing these examples we'll be using the Python interpreter. On top of this, there are a couple of other ways as well.īefore we get in to converting strings to numbers, and converting numbers to strings, let's first see a bit about how strings and numbers are represented in Python.
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The simplest way to do this is using the basic str(), int(), and float() functions. Python allows you to convert strings, integers, and floats interchangeably in a few different ways.