/usr/share/pyshared/Scientific/IO/NetCDF.py is in python-scientific 2.8-4.
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# adds some luxury and puts everything in its proper place in the
# package hierarchy.
#
# Written by Konrad Hinsen <hinsen@cnrs-orleans.fr>
# Last revision: 2008-8-18
#
"""
Python interface to the netCDF library
"""
import sys
if sys.modules.has_key('epydoc'):
# Fake code just for the docstrings!
from Scientific_netcdf import _C_API
class NetCDFFile:
"""
X{netCDF} file
A NetCDFFile object has two standard attributes: 'dimensions' and
'variables'. The values of both are dictionaries, mapping dimension
names to their associated lengths and variable names to variables,
respectively. Application programs should never modify these
dictionaries.
All other attributes correspond to global attributes defined in the
netCDF file. Global file attributes are created by assigning to
an attribute of the NetCDFFile object.
"""
def __init__(self, filename, mode):
"""
@param filename: name of the netCDF file. By convention,
netCDF files have the extension ".nc", but
this is not enforced. The filename may contain
a home directory indication starting with "~".
@type filename: C{str}
@param mode: access mode. "r" means read-only; no data can be
modified. "w" means write; a new file is created,
an existing file with the same name is deleted.
"a" means append (in analogy with serial files);
an existing file is opened for reading and writing,
if the file does not exist it is created. "r+" is
similar to "a", but the file must already exist.
An "s" can be appended to any of the modes listed
above; it indicates that the file will be opened
or created in "share" mode, which reduces buffering
in order to permit simultaneous read access by other
processes to a file that is being written.
@type mode: C{str}
"""
raise ImportError("this code should never be executed")
def close(self):
"""
Close the file. Any read or write access to the file
or one of its variables after closing raises an exception.
"""
pass
def createDimension(self, name, length):
"""
@param name: the name of the dimension
@type name: C{str}
@param length: the length of the new dimension. C{None} stands
for the unlimited dimension. Note that there
can be only one unlimited dimension per file.
@type length: C{int} or C{NoneType}
"""
pass
def createVariable(self, name, type, dimensions):
"""
@param name: the name of the new variable
@type name: C{str}
@param type: the data type of the elements; the same one-letter
codes as in C{Numeric} are used and the use of the
pre-defined constants (Numeric.Float etc.) is
strongly recommended.
@type type: C{str}
@param dimensions: a tuple of dimension names that have been
defined earlier
@type dimensions: C{tuple} of C{str}
@returns: the object corresponding to the new variable
@rtype: L{NetCDFVariable}
"""
pass
def sync(self):
"""
Write all buffered data to the disk file.
"""
flush = sync
class NetCDFVariable:
"""
Variable in a netCDF file
NetCDFVariable objects are constructed by calling the method
'createVariable' on the L{NetCDFFile} object.
NetCDFVariable objects behave much like array objects defined
in module Numeric, except that their data resides in a file.
Data is read by indexing and written by assigning to an
indexed subset; the entire array can be accessed by the index
'[:]' or using the methods 'getValue' and
'assignValue'. NetCDFVariable objects also have attribute
"shape" with the same meaning as for arrays, but the shape
cannot be modified. There is another read-only attribute
"dimensions", whose value is the tuple of dimension names.
All other attributes correspond to variable attributes defined in the
netCDF file. Variable attributes are created by assigning to
an attribute of the NetCDFVariable object.
B{Note:}
If a file open for reading is simultaneously written by another program,
the size of the unlimited dimension may change. Every time the shape
of a variable is requested, the current size will be obtained from
the file. For reading and writing, the size obtained during the last
shape request is used. This ensures consistency: foo[-1] means the
same thing no matter how often it is evaluated, as long as the shape
is not re-evaluated in between.
"""
def __init__(self, *args):
raise ImportError("this code should never be executed")
def assignValue(self, value):
"""
Assign a new value to the variable. This method allows
assignment to scalar variables, which cannot be indexed.
@param value: the new value for the variable
"""
pass
def getValue(self):
"""
Return the value of the variable. This method allows
access to scalar variables, which cannot be indexed.
@returns: the current value of the variable
"""
pass
def typecode(self):
"""
@returns: the variable's type code
@rtype: C{str}
"""
pass
else:
# This is the real code.
from Scientific_netcdf import *
from Scientific_netcdf import _C_API
import os
_NetCDFFile = NetCDFFile
def NetCDFFile(filename, mode=None, history=None):
filename = os.path.expanduser(filename)
args = (filename,)
if mode is not None:
args = args + (mode,)
if history is not None:
args = args + (history,)
return apply(_NetCDFFile, args)
del sys
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