小U盘传大电影时可以免去用winrar分割文件时的压缩和解压缩过程。
file.py
import sys
from os.path import exists
fileCount = 0
def splitFile(fileName, partSize=1):
# 1024 * 1024 = 1048576
length = partSize * 1048576
f1 = open(fileName, "rb")
while True:
content = f1.read(length)
if content == "":
break
newFile = distFile(fileName)
f2 = open(newFile, "wb")
f2.write(content)
f2.close()
f1.close()
print ’split file complete!’
def distFile(sourceFile):
global fileCount
fileCount = fileCount + 1
extPos = sourceFile.rfind(‘.’)
if extPos > 0:
return sourceFile + ‘.part’ + str(fileCount)
else: # extPos == -1
print ‘File type? Can not split!’
sys.exit(1)
def combine(filename):
count = 0
extPos = filename.find(‘.part’)
if extPos > 0:
file = filename[:extPos]
f1 = open(file, "wb")
while True:
count = count + 1
partFile = file + ‘.part’ + str(count)
if not exists(partFile):
break
else:
f2 = open(partFile, "rb")
content = f2.read()
f2.close()
f1.write(content)
f1.close()
print ‘combine file complete!’
else:
print ‘File type? Can not combine!’
def usage():
print ”’usage is "file.py s[c] filename" or "file.py s[c] filename size(M)
’s’ — ’split’, ‘c’ — ‘combine" ”’
if __name__ == "__main__":
if len(sys.argv) !=3 and len(sys.argv) !=4:
usage()
sys.exit(1)
if sys.argv[1] == ’s’:
if len(sys.argv) == 3:
splitFile(sys.argv[2])
elif len(sys.argv) == 4 and int(sys.argv[3]) > 0:
splitFile(sys.argv[2], int(sys.argv[3]))
else:
usage()
sys.exit(1)
elif sys.argv[1] ==’c':
if len(sys.argv) == 3:
combine(sys.argv[2])
else:
usage()
else:
usage()