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Python Reference Manual

Previous: 2.4.4 Integer and long Up: 2.4 Literals Next: 2.4.6 Imaginary literals

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2.4.5 Floating point literals

Floating point literals are described by the following lexical definitions:

floatnumber	::=	pointfloat | exponentfloat
pointfloat	::=	[intpart] fraction | intpart "."
exponentfloat	::=	(intpart | pointfloat) exponent
intpart	::=	digit+
fraction	::=	"." digit+
exponent	::=	("e" | "E") ["+" | "-"] digit+

Download entire grammar as text.

Note that the integer and exponent parts of floating point numbers can look like octal integers, but are interpreted using radix 10. For example, "077e010" is legal, and denotes the same number as "77e10". The allowed range of floating point literals is implementation-dependent. Some examples of floating point literals:

3.14    10.    .001    1e100    3.14e-10    0e0

Note that numeric literals do not include a sign; a phrase like -1 is actually an expression composed of the operator - and the literal 1.

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Python Reference Manual

Previous: 2.4.4 Integer and long Up: 2.4 Literals Next: 2.4.6 Imaginary literals

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Release 2.2.3, documentation updated on 30 May 2003.