【发布时间】：2012-08-08 20:38:34
【问题描述】：
我下载了这个脚本来帮助我转换一些 PNG。然而，从 2003 年开始，我第一次尝试运行它时，它给了我异常语法的错误。我设法解决了这个问题并再次运行它。然后它给了我打印语法的错误。我也修复了这些。现在我完全不知道除了脚本不起作用之外发生了什么。
脚本是：
from struct import *
from zlib import *
import stat
import sys
import os
def getNormalizedPNG(filename):
pngheader = "\x89PNG\r\n\x1a\n"
file = open(filename, "rb")
oldPNG = file.read()
file.close()
if oldPNG[:8] != pngheader:
return None
newPNG = oldPNG[:8]
chunkPos = len(newPNG)
# For each chunk in the PNG file
while chunkPos < len(oldPNG):
# Reading chunk
chunkLength = oldPNG[chunkPos:chunkPos+4]
chunkLength = unpack(">L", chunkLength)[0]
chunkType = oldPNG[chunkPos+4 : chunkPos+8]
chunkData = oldPNG[chunkPos+8:chunkPos+8+chunkLength]
chunkCRC = oldPNG[chunkPos+chunkLength+8:chunkPos+chunkLength+12]
chunkCRC = unpack(">L", chunkCRC)[0]
chunkPos += chunkLength + 12
# Parsing the header chunk
if chunkType == "IHDR":
width = unpack(">L", chunkData[0:4])[0]
height = unpack(">L", chunkData[4:8])[0]
# Parsing the image chunk
if chunkType == "IDAT":
try:
# Uncompressing the image chunk
bufSize = width * height * 4 + height
chunkData = decompress( chunkData, -8, bufSize)
except Exception as e:
# The PNG image is normalized
return None
# Swapping red & blue bytes for each pixel
newdata = ""
for y in xrange(height):
i = len(newdata)
newdata += chunkData[i]
for x in xrange(width):
i = len(newdata)
newdata += chunkData[i+2]
newdata += chunkData[i+1]
newdata += chunkData[i+0]
newdata += chunkData[i+3]
# Compressing the image chunk
chunkData = newdata
chunkData = compress( chunkData )
chunkLength = len( chunkData )
chunkCRC = crc32(chunkType)
chunkCRC = crc32(chunkData, chunkCRC)
chunkCRC = (chunkCRC + 0x100000000) % 0x100000000
# Removing CgBI chunk
if chunkType != "CgBI":
newPNG += pack(">L", chunkLength)
newPNG += chunkType
if chunkLength > 0:
newPNG += chunkData
newPNG += pack(">L", chunkCRC)
# Stopping the PNG file parsing
if chunkType == "IEND":
break
return newPNG
def updatePNG(filename):
data = getNormalizedPNG(filename)
if data != None:
file = open(filename, "wb")
file.write(data)
file.close()
return True
return data
def getFiles(base):
global _dirs
global _pngs
if base == ".":
_dirs = []
_pngs = []
if base in _dirs:
return
files = os.listdir(base)
for file in files:
filepath = os.path.join(base, file)
try:
st = os.lstat(filepath)
except os.error:
continue
if stat.S_ISDIR(st.st_mode):
if not filepath in _dirs:
getFiles(filepath)
_dirs.append( filepath )
elif file[-4:].lower() == ".png":
if not filepath in _pngs:
_pngs.append( filepath )
if base == ".":
return _dirs, _pngs
print ("iPhone PNG Images Normalizer v1.0")
print (" ")
print ("[+] Searching PNG files..."),
dirs, pngs = getFiles(".")
print ("ok")
if len(pngs) == 0:
print (" ")
print ("[!] Alert: There are no PNG files found. Move this python file to the folder that contains the PNG files to normalize.")
exit()
print (" ")
print (" - %d PNG files were found at this folder (and subfolders).") % len(pngs)
print (" ")
while True:
normalize = raw_input("[?] Do you want to normalize all images (Y/N)? ").lower()
if len(normalize) > 0 and (normalize[0] == "y" or normalize[0] == "n"):
break
normalized = 0
if normalize[0] == "y":
for ipng in xrange(len(pngs)):
perc = (float(ipng) / len(pngs)) * 100.0
print ("%.2f%% %s") % (perc, pngs[ipng])
if updatePNG(pngs[ipng]):
normalized += 1
print (" ")
print ("[+] %d PNG files were normalized.") % normalized
现在当我在 DOS 窗口中运行它时，我得到了这个错误：
C:\wamp\www\py>ipin.py
iPhone PNG Images Normalizer v1.0
[+] Searching PNG files...
ok
- %d PNG files were found at this folder (and subfolders).
Traceback (most recent call last):
File "C:\wamp\www\py\ipin.py", line 158, in <module>
print (" - %d PNG files were found at this folder (and subfolders).") % len(pngs)
TypeError: unsupported operand type(s) for %: 'NoneType' and 'int'
我该怎么办？
【问题讨论】：
-
你试过在上面运行2to3吗？你也可以安装 2.7 版的 python，这是大多数人无论如何都使用的。
-
是否有可能获得一些关于有多少人使用每个版本的 Python 的记录统计数据？
-
@NoctisSkytower 据我所知，不，我只是根据轶事证据说话，因为我从未真正遇到过使用 Python 3 的人，而且这里似乎很少有问题使用 Python 3。
标签： python python-3.x