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#!/bin/env python
import sys
import struct
try:
f=open(sys.argv[1],'rb')
except (IOError,Exception):
print '''usage:
scriptname segyfilename
'''
sys.exit(1)
#skip EBCDIC header
try:
f.seek(3200)
except Exception:
print 'Oops! your file is broken..'
#read binary header
binhead = f.read(400)
ns = struct.unpack('>h',binhead[20:22])[0]
if ns < 0:
print 'file read error'
sys.exit(1)
#read trace header
while True:
trchead = f.read(240)
if trchead == '':
break
nav = trchead[224:228]+\
trchead[228:232]+\
trchead[200:204]+\
trchead[204:208]+\
trchead[60:64]
#define output format
nl = struct.unpack('>5i',nav)
print 'QL%-4d%9s%10.2f%10.2f%5s' % (nl[0], nl[1], nl[2]/100.0, nl[3]/100.0, nl[4])
f.seek(ns*4,1)
f.close()
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from: http://www.cnblogs.com/jimnox/archive/2009/12/08/tips-to-python-challenge.html
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#Filename: stack.py
shoplist=['apple','mango','carrot','banana']
shoplist.append('rice')
popitem=shoplist[-1]
del shoplist[-1]
print 'the popitem is',popitem
......
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shoplist=['apple','mango','carrot','banana']
print 'I have',len(shoplist),'items to purchase'
print 'these items are:'
for item in shoplist:
print item,
shoplist.append('rice')
print 'my shopping list is now', shoplist
shoplist. ......
1.open
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file_object = open('thefile.txt')
try:
all_the_text = file_object.read( )
finally:
file_object.close( )
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