无法写入文本文件 python 2.7 无效语法？

Question

我的代码运行良好，但我希望它将值写入文本文件。当我尝试这样做时，我得到“无效的语法”。当我使用 python shell 时，它可以工作。所以我不明白为什么它在我的脚本中不起作用。

我敢打赌，这很傻，但为什么不将数据输出到文本文件？？

#!/usr/bin/env python

#standard module, needed as we deal with command line args
import sys

from fractions import Fraction
import pyexiv2


#checking whether we got enough args, if not, tell how to use, and exits
#if len(sys.argv) != 2 :
#    print "incorrect argument, usage: " + sys.argv[0] + ' <filename>'
#    sys.exit(1)

#so the argument seems to be ok, we use it as an imagefile 
imagefilename = sys.argv[1]



#trying to catch the exceptions in case of problem with the file reading
try:
    metadata = pyexiv2.metadata.ImageMetadata(imagefilename)
    metadata.read();

#trying to catch the exceptions in case of problem with the GPS data reading
    try:
        latitude = metadata.__getitem__("Exif.GPSInfo.GPSLatitude")
        latitudeRef = metadata.__getitem__("Exif.GPSInfo.GPSLatitudeRef")
        longitude = metadata.__getitem__("Exif.GPSInfo.GPSLongitude")
        longitudeRef = metadata.__getitem__("Exif.GPSInfo.GPSLongitudeRef")

        # get the value of the tag, and make it float number
        alt = float(metadata.__getitem__("Exif.GPSInfo.GPSAltitude").value)


        # get human readable values
        latitude = str(latitude).split("=")[1][1:-1].split(" ");
        latitude = map(lambda f: str(float(Fraction(f))), latitude)
        latitude = latitude[0] + u"\u00b0" + latitude[1] + "'" + latitude[2] + '"' + " " + str(latitudeRef).split("=")[1][1:-1]

        longitude = str(longitude).split("=")[1][1:-1].split(" ");
        longitude = map(lambda f: str(float(Fraction(f))), longitude)
        longitude = longitude[0] + u"\u00b0" + longitude[1] + "'" + longitude[2] + '"' + " " + str(longitudeRef).split("=")[1][1:-1]

        ## Printing out, might need to be modified if other format needed
        ## i just simple put tabs here to make nice columns
    print " \n A text file has been created with the following information \n"
    print "GPS EXIF data for " + imagefilename    
        print "Latitude:\t" + latitude 
        print "Longitude:\t" + longitude
        print "Altitude:\t" + str(alt) + " m"
    except Exception, e:  # complain if the GPS reading went wrong, and print the exception
        print "Missing GPS info for " + imagefilename
        print e

# Create a new file or **overwrite an existing file**
text_file = open('textfile.txt', 'w')
text_file.write("Latitude" + latitude)
# Close the output file
text_file.close()


except Exception, e:   # complain if the GPS reading went wrong, and print the exception
    print "Error processing image " + imagefilename
    print e;

我看到的错误是：

text_file = open('textfile.txt','w')
        ^
SyntaxError: invalid syntax

Answer 1

文件打开在第一个尝试块内。它在第二次尝试之外，除了块。将其移到第一个 try except 块之外或增加缩进以将它们包含在第一个 try 块中。它应该在那里工作正常。

同时在 try 中移动（增加缩进）两个打印语句。

这对你有用：

#!/usr/bin/env python

#standard module, needed as we deal with command line args
import sys

from fractions import Fraction
import pyexiv2


#checking whether we got enough args, if not, tell how to use, and exits
#if len(sys.argv) != 2 :
#    print "incorrect argument, usage: " + sys.argv[0] + ' <filename>'
#    sys.exit(1)

#so the argument seems to be ok, we use it as an imagefile 
imagefilename = sys.argv[1]



#trying to catch the exceptions in case of problem with the file reading
try:
    metadata = pyexiv2.metadata.ImageMetadata(imagefilename)
    metadata.read();

#trying to catch the exceptions in case of problem with the GPS data reading
    try:
        latitude = metadata.__getitem__("Exif.GPSInfo.GPSLatitude")
        latitudeRef = metadata.__getitem__("Exif.GPSInfo.GPSLatitudeRef")
        longitude = metadata.__getitem__("Exif.GPSInfo.GPSLongitude")
        longitudeRef = metadata.__getitem__("Exif.GPSInfo.GPSLongitudeRef")

        # get the value of the tag, and make it float number
        alt = float(metadata.__getitem__("Exif.GPSInfo.GPSAltitude").value)


        # get human readable values
        latitude = str(latitude).split("=")[1][1:-1].split(" ");
        latitude = map(lambda f: str(float(Fraction(f))), latitude)
        latitude = latitude[0] + u"\u00b0" + latitude[1] + "'" + latitude[2] + '"' + " " + str(latitudeRef).split("=")[1][1:-1]

        longitude = str(longitude).split("=")[1][1:-1].split(" ");
        longitude = map(lambda f: str(float(Fraction(f))), longitude)
        longitude = longitude[0] + u"\u00b0" + longitude[1] + "'" + longitude[2] + '"' + " " + str(longitudeRef).split("=")[1][1:-1]

        ## Printing out, might need to be modified if other format needed
        ## i just simple put tabs here to make nice columns
        print " \n A text file has been created with the following information \n"
        print "GPS EXIF data for " + imagefilename    
        print "Latitude:\t" + latitude 
        print "Longitude:\t" + longitude
        print "Altitude:\t" + str(alt) + " m"
    except Exception, e:  # complain if the GPS reading went wrong, and print the exception
        print "Missing GPS info for " + imagefilename
        print e

    # Create a new file or **overwrite an existing file**
    text_file = open('textfile.txt', 'w')
    text_file.write("Latitude" + latitude)
    # Close the output file
    text_file.close()


except Exception, e:   # complain if the GPS reading went wrong, and print the exception
    print "Error processing image " + imagefilename
    print e;

Answer 2

你是不是表错了？...行：

print " \n A text file has been created with the following information \n"
print "GPS EXIF data for " + imagefilename    

列表似乎有误

编辑：您发布的代码 - 跟踪之一 - 也是错误的表格。