diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/lib/libfuncs.tex | 47 |
1 files changed, 28 insertions, 19 deletions
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex index 973e293..ef28a8a 100644 --- a/Doc/lib/libfuncs.tex +++ b/Doc/lib/libfuncs.tex @@ -80,13 +80,14 @@ def my_import(name): above.} \end{funcdesc} -\begin{funcdesc}{bool}{x} +\begin{funcdesc}{bool}{\optional{x}} Convert a value to a Boolean, using the standard truth testing procedure. If \code{x} is false, this returns \code{False}; otherwise it returns \code{True}. \code{bool} is also a class, which is a subclass of \code{int}. Class \code{bool} cannot be subclassed further. Its only instances are \code{False} and - \code{True}. + \code{True}. If no argument is given, this function returns + \code{False}. \indexii{Boolean}{type} \versionadded{2.2.1} \end{funcdesc} @@ -132,8 +133,9 @@ class C: f = classmethod(f) \end{verbatim} - It can be called either on the class (e.g. C.f()) or on an instance - (e.g. C().f()). The instance is ignored except for its class. + It can be called either on the class (such as \code{C.f()}) or on an + instance (such as \code{C().f()}). The instance is ignored except for + its class. If a class method is called for a derived class, the derived class object is passed as the implied first argument. @@ -195,7 +197,7 @@ class C: \module{__future__} module. \end{funcdesc} -\begin{funcdesc}{complex}{real\optional{, imag}} +\begin{funcdesc}{complex}{\optional{real\optional{, imag}}} Create a complex number with the value \var{real} + \var{imag}*j or convert a string or number to a complex number. If the first parameter is a string, it will be interpreted as a complex number @@ -204,7 +206,8 @@ class C: 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 \function{int()}, - \function{long()} and \function{float()}. + \function{long()} and \function{float()}. If both arguments + are omitted, returns \code{0j}. \end{funcdesc} \begin{funcdesc}{delattr}{object, name} @@ -447,14 +450,14 @@ class C: None. \end{funcdesc} -\begin{funcdesc}{float}{x} +\begin{funcdesc}{float}{\optional{x}} Convert a string or a number to floating point. If the argument is a string, it must contain a possibly signed 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. + precision) is returned. If no argument is given, returns \code{0.0}. \note{When passing in a string, values for NaN\index{NaN} and Infinity\index{Infinity} may be returned, depending on the @@ -540,7 +543,7 @@ class C: from users. \end{funcdesc} -\begin{funcdesc}{int}{x\optional{, radix}} +\begin{funcdesc}{int}{\optional{x\optional{, radix}}} Convert a string or number to a plain integer. If the argument is a string, it must contain a possibly signed decimal number representable as a Python integer, possibly embedded in whitespace. @@ -554,7 +557,7 @@ class C: long integer or a floating point number. Conversion of floating point numbers to integers truncates (towards zero). If the argument is outside the integer range a long object will - be returned instead. + be returned instead. If no arguments are given, returns \code{0}. \end{funcdesc} \begin{funcdesc}{intern}{string} @@ -625,7 +628,8 @@ class C: \var{sequence} is already a list, a copy is made and returned, similar to \code{\var{sequence}[:]}. For instance, \code{list('abc')} returns \code{['a', 'b', 'c']} and \code{list( - (1, 2, 3) )} returns \code{[1, 2, 3]}. + (1, 2, 3) )} returns \code{[1, 2, 3]}. If no argument is given, + returns a new empty list, \code{[]}. \end{funcdesc} \begin{funcdesc}{locals}{} @@ -635,7 +639,7 @@ class C: interpreter.} \end{funcdesc} -\begin{funcdesc}{long}{x\optional{, radix}} +\begin{funcdesc}{long}{\optional{x\optional{, radix}}} Convert a string or number to a long integer. If the argument is a string, it must contain a possibly signed number of arbitrary size, possibly embedded in whitespace; @@ -645,7 +649,8 @@ class C: Otherwise, the argument may be a plain or long integer or a floating point number, and a long integer with the same value is returned. Conversion of floating - point numbers to integers truncates (towards zero). + point numbers to integers truncates (towards zero). If no arguments + are given, returns \code{0L}. \end{funcdesc} \begin{funcdesc}{map}{function, list, ...} @@ -896,8 +901,9 @@ class C: f = staticmethod(f) \end{verbatim} - It can be called either on the class (e.g. C.f()) or on an instance - (e.g. C().f()). The instance is ignored except for its class. + It can be called either on the class (such as \code{C.f()}) or on an + instance (such as \code{C().f()}). The instance is ignored except + for its class. Static methods in Python are similar to those found in Java or C++. For a more advanced concept, see \ref{classmethod}. @@ -929,13 +935,14 @@ class C(B): \versionadded{2.2} \end{funcdesc} -\begin{funcdesc}{str}{object} +\begin{funcdesc}{str}{\optional{object}} Return a string containing a nicely printable representation of an object. For strings, this returns the string itself. The difference with \code{repr(\var{object})} is that \code{str(\var{object})} does not always attempt to return a string that is acceptable to \function{eval()}; its goal is to return a - printable string. + printable string. If no argument is given, returns the empty + string, \code{''}. \end{funcdesc} \begin{funcdesc}{tuple}{\optional{sequence}} @@ -945,7 +952,8 @@ class C(B): If \var{sequence} is already a tuple, it is returned unchanged. For instance, \code{tuple('abc')} returns returns \code{('a', 'b', 'c')} and \code{tuple([1, 2, 3])} returns - \code{(1, 2, 3)}. + \code{(1, 2, 3)}. If no argument is given, returns a new empty + tuple, \code{()}. \end{funcdesc} \begin{funcdesc}{type}{object} @@ -981,7 +989,8 @@ It's a function \versionadded{2.0} \end{funcdesc} -\begin{funcdesc}{unicode}{object\optional{, encoding\optional{, errors}}} +\begin{funcdesc}{unicode}{\optional{object\optional{, encoding + \optional{, errors}}}} Return the Unicode string version of \var{object} using one of the following modes: |