Script for Python Tutorial 4
----------------------------
dir
print __name__
dir(__builtins__)
from pyfits import *
dir()
f = open('junk.txt','w')
f = __builtins__.open('junk.txt','w')
raise SystemExit
import pyfits
dir()
dir(pyfits)
def cube(x):
'''Take the cube of x'''
return x*x*x
cube(3)
cube(2.2)
cube()
cube('2')
cube.__doc__
calias = cube
calias(3)
def integrate(function, start, stop):
'''Very crude integration function'''
total = 0
for value in range(start,stop):
total += function(value)
return total
integrate(cube,1,10)
data = pyfits.getdata('pix.fits').astype('Float32')
data
data3 = cube(data)
data3
cube(x=3)
def integrate(function,start=0,stop=10):
integrate(cube)
integrate(stop=5,start=1,function=cube)
integrate(cube,3)
integrate(cube,start=2,7)
def average(*args):
total = 0.0
for arg in args:
total += args
return total/len(args)
def makedict(**keywords):
'''Make a dictionary from a function'''
newdict = {}
for keyword in keywords.keys():
newdict[keyword] = keywords[keyword]
return newdict
def wild_and_crazy_function(mode, *filenames, **options):
#!/usr/bin/env python
print 'script starting up'
for item in [1,4,9]:
print item
chmod a+x test
test or ./test
python test
execfile('test')
run test
#!/usr/bin/env python
def cube(x):
'''Take the cube of x'''
returd x*x*x
import cube
[test fails]
[edit cube.py]
reload(cube)
[etc]
import cube as mm
from cube import *
from cube import cube
import cube
cube(3)
cube.cube(3)
add:
print __name__
reload(cube)
cube.cube(3)
#!/usr/bin/env python
import sys
def cube(x):
'''Take the cube of x'''
print __name__
return x*x*x
if __name__ == '__main__':
_nargs = len(sys.argv)
if _nargs != 2:
print 'Usage: cube x'
else:
print cube(float(sys.argv[1]))
python cube 5
import cube
cube.cube(3)
x = 3
y = 0
ratio = 0.0
try:
ratio = y/x
except ZeroDivisionError:
print 'Divisor=0'
try:
[do stuff]
except SomeError:
[respond to this particular error]
raise SomeError
f = open('thisfile.txt','w')
try:
[do something with the file]
finally:
f.close()
try:
[do stuff]
except:
[respond to every type of exception]
raise SystemExit
im = pyfits.getdata('pix.fits')
im=0
im = pyfits.getdata('pix.fits')
del im
sim=im
im=0
sim=0
sim=im[:1,:1]
im=0
sim=0
mylist=[1,'hello',im]
im=0
mylist[2]=0
imshow(im)
im=0
cla()
list1=[1,im]
list2=[list1]
list1[0] = list2
im=list1=list2 = 0
#!/usr/bin/env python
import sys
def cube(x):
'''Take the cube of x'''
return x*x*x
if __name__ == '__main__':
_nargs = len(sys.argv)
if _nargs == 1:
x = raw_input("Enter number to be cubed: ")
else:
x = sys.argv[1]
print cube(float(x))
f = open('login.cl','r')
flist = f.readlines()
flist
flist[0]
words = flist[0].split(' ')
words
words.reverse()
words
flist[0] = ' '.join(words)
flist[0]
2/4
from __future__ import division
2/4
x = 1,2,3,4,5
x
type(x)
x,y,z = 2,5,6
x
y
z
def powers(x):
square = x*x
cube = x*x*x
fourth = x*x*x*x
return square, cube, fourth
powers(3)
x,y = 10,6
x,y = y,x
x,y
imstat *flt.fits[sci,*]
files *flt.fits[sci,*]
import pyfits
from pyraf import pyraf
def extensions(filespec, ext=None):
'''A module to return a list of files that meet the specification'''
filelist = iraf.files(filespec, Stdout=1)
outlist = []
for exposure in filelist:
thisfile = pyfits.open(exposure)
_nextensions = len(thisfile)
for i in range(_nextensions)[1:]
if(thisfile[i].header['extname'] == ext.upper():
extver = thisfile[i].header['extver']
outlist.append(exposure + '[' + ext + ',' + str(extver) + ']')
thisfile.close()
return outlist
from extensions import *
extensions('j*flt.fits','sci')
for extension in extensions('j*flt.fits','sci')
iraf.imstat(extension)
