创建文件并尝试使用Python复制文件的故障排除

Question

因此，我试图使用argv创建一个文件，然后尝试复制此文件，当我尝试运行它时，我在第16行得到错误。这是出于教育目的，我试图在这项工作后，遵循“学习python困难的方式“电子书。

Error message:
   file "new_prog.py, line 16, in <module>
     newfile.write(line1)
AttributeError: 'str' object has no attribute 'write'

以下脚本

from sys import argv
from os.path import exists

newfile, nyfil = argv
print "First we erase is incase it already exists, filename is %r." % newfile

print "We are going to attempt to write a file and copy it."
newfile = raw_input("New filename: ")

print "Write the first line of the document"
line1 = raw_input("First line: ")
print "Write the second line of the document"
line2 = raw_input("Second line: ")
print "Write the last lines, can be coaherent"
lines = raw_input("last lines: ")

newfile.write(line1)
newfile.write("\n")
newfile.write(line2)
newfile.write("\n")
newfile.write(lines)
newfile.write("End of document")
newfile.close()

print "Closing %r for copying" % (newfile)
print "Checking if the new file exists. %r" % exists(nyfil)
raw_input("Press a key to continue")

nyfil = open(newfile, 'w')
nyfil = write(newfile)

nyfil.close()
print "All done, files are printed and copied"

正在运行的新代码，谢谢。

from sys import argv
from os.path import exists

newfile, nyfil = argv
print "First we erase is incase it already exists, filename is %r." % newfile

print "We are going to attempt to write a file and copy it."
newfile = raw_input("New filename: ")

print "Write the first line of the document"
line1 = raw_input("First line: ")
print "Write the second line of the document"
line2 = raw_input("Second line: ")
print "Write the last lines, can be coaherent"
lines = raw_input("last lines: ")

with open(newfile, 'w') as f:
    f.write(line1)
    f.write("\n")
    f.write(line2)
    f.write("\n")
    f.write(lines)
    f.write("\n")
    f.write ("End of document")

print "Closing %r for copying" % (newfile)
print "Checking if the new file exists. %r" % exists(nyfil)
raw_input("Press a key to continue")

with open(newfile, 'w') as f:
    f.write(nyfil)

print "All done, files are printed and copied"

Answer 1

newfile = raw_input("New filename: ")

newfile是一个字符串而不是文件对象，因此错误是有意义的。您需要执行以下操作：

with open(newfile, "w") as f:
    f.write(line1)
    f.write("\n")
    etc....

我不完全确定你的代码是做什么的，但是这个例子将展示如何将文件名作为命令行arg并写入你输入的行：

def write_to_file(newfile):
    print "You entered filename  {}".format(newfile) # string formatting

    print "We are going  to write to a file."
    newfile = raw_input("New filename: ")

    print "Write the first line of the document"
    line1 = raw_input("First line: ")
    print "Write the second line of the document"
    line2 = raw_input("Second line: ")
    print "Write the last lines, can be coaherent"
    lines = raw_input("last lines: ")
    with open(newfile, "w") as f: # use with to open files as it closes them automatically
            f.write(line1)
            f.write("\n")
            f.write(line2)
            f.write("\n")
            f.write(lines)
            f.write("End of document")
    print "Finished writing to {}".format(newfile)
if __name__ =="__main__": 
    write_to_file(sys.argv[1]) # command line arg

将脚本保存为foo.py，然后使用python foo.py foo.txt运行该脚本，它将创建并将您的输入写入foo.txt文件。