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Add complex().

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Update int(), long(), float() to support string conversions.
This commit is contained in:
Guido van Rossum 1997-04-02 06:04:02 +00:00
parent 740eb8265f
commit 1cd26f2fc0
2 changed files with 60 additions and 10 deletions
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35
Doc/lib/libfuncs.tex
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@ -57,6 +57,14 @@ be added to the end of the the argument list.
\code{None} will printed).
\end{funcdesc}
\begin{funcdesc}{complex}{real\optional{, imag}}
Create a complex number with the value \var{real} + \var{imag}*j.
Each argument may be any numeric type (including complex).
If \var{imag} is omitted, it defaults to zero and the function
serves as a numeric conversion function like \code{int}, \code{long}
and \code{float}.
\end{funcdesc}
\begin{funcdesc}{delattr}{object\, name}
This is a relative of \code{setattr}. The arguments are an
object and a string. The string must be the name
@ -153,8 +161,14 @@ removed.
\end{funcdesc}
\begin{funcdesc}{float}{x}
Convert a number to floating point. The argument may be a plain or
long integer or a floating point number.
Convert a string or a number to floating point. If the argument is a
string, it must contain a possibly singed decimal or floating point
number, possibly embedded in whitespace;
this behaves identical to \code{string.atof(\var{x})}.
Otherwise, the argument may be a plain or
long integer or a floating point number, and a floating point number
with the same value (within Python's floating point precision) is
returned.
\end{funcdesc}
\begin{funcdesc}{getattr}{object\, name}
@ -226,7 +240,11 @@ module from which it is called).
\end{funcdesc}
\begin{funcdesc}{int}{x}
Convert a number to a plain integer. The argument may be a plain or
Convert a string or number to a plain integer. If the argument is a
string, it must contain a possibly singed decimal number
representable as a Python integer, possibly embedded in whitespace;
this behaves identical to \code{string.atoi(\var{x})}.
Otherwise, the argument may be a plain or
long integer or a floating point number. Conversion of floating
point numbers to integers is defined by the C semantics; normally
the conversion truncates towards zero.\footnote{This is ugly --- the
@ -245,8 +263,15 @@ desired effect.
\end{funcdesc}
\begin{funcdesc}{long}{x}
Convert a number to a long integer. The argument may be a plain or
long integer or a floating point number.
Convert a string or number to a long integer. If the argument is a
string, it must contain a possibly singed decimal number of
arbitrary size, possibly embedded in whitespace;
this behaves identical to \code{string.atol(\var{x})}.
Otherwise, the argument may be a plain or
long integer or a floating point number, and a long interger with
the same value is returned. Conversion of floating
point numbers to integers is defined by the C semantics;
see the description of \code{int()}.
\end{funcdesc}
\begin{funcdesc}{map}{function\, list\, ...}