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- functions: DTML Functions
-
- DTML utility functions provide some Python built-in functions and
- some DTML-specific functions.
-
- Functions
-
- abs(number) -- Return the absolute value of a number. The argument may
- be a plain or long integer or a floating point number. If the argument
- is a complex number, its magnitude is returned.
-
- chr(integer) -- Return a string of one character whose ASCII code is
- the integer i, e.g., chr(97) returns the string 'a'. This is the
- inverse of ord(). The argument must be in the range [0..255],
- inclusive; ValueError will be raised if i is outside that range.
-
- DateTime() -- Returns a Zope 'DateTime' object given constructor
- arguments. See the "DateTime":DateTime.py API reference for more
- information on constructor arguments.
-
- divmod(number, number) -- Take two numbers as arguments and return a
- pair of numbers consisting of their quotient and remainder when using
- long division. With mixed operand types, the rules for binary
- arithmetic operators apply. For plain and long integers, the result
- is the same as (a / b, a % b). For floating point numbers the result
- is (q, a % b), where q is usually math.floor(a / b) but may be 1
- less than that. In any case q * b + a % b is very close to a, if a %
- b is non-zero it has the same sign as b, and 0 <= abs(a % b) <
- abs(b).
-
- float(number) -- 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 string.atof(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.
-
- getattr(object, string) -- Return the value of the named attributed of
- object. name must be a string. If the string is the name of one of the
- object's attributes, the result is the value of that attribute. For
- example, getattr(x, 'foobar') is equivalent to x.foobar. If the named
- attribute does not exist, default is returned if provided, otherwise
- AttributeError is raised.
-
- getitem(variable, render=0) -- Returns the value of a DTML variable.
- If 'render' is true, the variable is rendered.
-
- hasattr(object, string) -- The arguments are an object and a
- string. The result is 1 if the string is the name of one of the
- object's attributes, 0 if not. (This is implemented by calling
- getattr(object, name) and seeing whether it raises an exception or
- not.)
-
- hash(object) -- Return the hash value of the object (if it has
- one). Hash values are integers. They are used to quickly compare
- dictionary keys during a dictionary lookup. Numeric values that compare
- equal have the same hash value (even if they are of different types,
- e.g. 1 and 1.0).
-
- has_key(variable) -- Returns true if the DTML namespace contains the
- named variable.
-
- hex(integer) -- Convert an integer number (of any size) to a
- hexadecimal string. The result is a valid Python expression. Note: this
- always yields an unsigned literal, e.g. on a 32-bit machine, hex(-1)
- yields '0xffffffff'. When evaluated on a machine with the same word
- size, this literal is evaluated as -1; at a different word size, it
- may turn up as a large positive number or raise an OverflowError
- exception.
-
- int(number) -- 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;
- this behaves identical to string.atoi(x[, radix]). The radix parameter
- gives the base for the conversion and may be any integer in the range
- [2, 36]. If radix is specified and x is not a string, TypeError is
- raised. 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.
-
- len(sequence) -- Return the length (the number of items) of an
- object. The argument may be a sequence (string, tuple or list) or a
- mapping (dictionary).
-
- max(s) -- With a single argument s, return the largest item of a
- non-empty sequence (e.g., a string, tuple or list). With more than one
- argument, return the largest of the arguments.
-
- min(s) -- With a single argument s, return the smallest item of
- a non-empty sequence (e.g., a string, tuple or list). With more than
- one argument, return the smallest of the arguments.
-
- namespace([name=value]...) -- Returns a new DTML namespace object.
- Keyword argument 'name=value' pairs are pushed into the new
- namespace.
-
- oct(integer) -- Convert an integer number (of any size) to an octal
- string. The result is a valid Python expression. Note: this always
- yields an unsigned literal, e.g. on a 32-bit machine, oct(-1) yields
- '037777777777'. When evaluated on a machine with the same word size,
- this literal is evaluated as -1; at a different word size, it may
- turn up as a large positive number or raise an OverflowError
- exception.
-
- ord(character) -- Return the ASCII value of a string of one
- character. E.g., ord('a') returns the integer 97. This is the
- inverse of chr().
-
- pow(x, y [,z]) -- Return x to the power y; if z is present, return
- x to the power y, modulo z (computed more efficiently than pow(x, y) %
- z). The arguments must have numeric types. With mixed operand types,
- the rules for binary arithmetic operators apply. The effective operand
- type is also the type of the result; if the result is not expressible
- in this type, the function raises an exception; e.g., pow(2, -1) or
- pow(2, 35000) is not allowed.
-
- range([start,] stop [,step]) -- This is a versatile function to
- create lists containing arithmetic progressions.
- The arguments must be plain integers. If the
- step argument is omitted, it defaults to 1. If the start argument
- is omitted, it defaults to 0. The full form returns a
- list of plain integers [start, start + step, start + 2 * step,
- ...]. If step is positive, the last element is the largest
- start + i * step less than stop; if step is negative, the last
- element is the largest start + i * step greater than stop. step
- must not be zero (or else ValueError is raised).
-
- round(x [,n]) -- Return the floating point value x rounded to n
- digits after the decimal point. If n is omitted, it defaults to
- zero. The result is a floating point number. Values are rounded to the
- closest multiple of 10 to the power minus n; if two multiples are
- equally close, rounding is done away from 0 (so e.g. round(0.5) is 1.0
- and round(-0.5) is -1.0).
-
- render(object) -- Render 'object'. For DTML objects this renders
- (calls) the DTML. For other objects, this is equivalent to
- 'str(object)'.
-
- reorder(s [,with] [,without]) -- Reorder the items in s according
- to the order given in with and with items mentioned in without
- removed. Items from s not mentioned in with are removed. s,
- with, and without are all either sequences of strings or
- sequences of key-value tuples, with ordering done on the
- keys. This function is useful for constructing ordered select
- lists.
-
- str(object) -- Return a string containing a nicely printable
- representation of an object. For strings, this returns the string
- itself.
-
- test(condition, result [,condition, result]... [,default]) --
- Takes one or more condition, result pairs and returns the result
- of the first true condition. Only one result is returned, even if
- more than one condition is true. If no condition is true and a
- default is given, the default is returned. If no condition is true
- and there is no default, None is returned.
-
- Attributes
-
- None -- The 'None' object is equivalent to the Python built-in object
- 'None'. This is usually used to represent a Null or false value.
-
- See Also
-
- "'string' module":dtml-string.stx
-
- "'whrandom' module":dtml-whrandom.stx
-
- "'math' module":dtml-math.stx
-
- "Built-in Python Functions":http://www.python.org/doc/current/lib/built-in-funcs.html
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