新的python用户..用.read打印txt文件，不工作

Question

我正在阅读 Zed Shaw 的 How to Learn Python the Hard Way，但我无法正确理解这一部分。我正在尝试重写 txt 文件的内容然后打印它，我的最后一行不起作用（在我打印“我要将这些写入文件。”后没有任何显示），它似乎可以工作，直到我添加了 .read 命令...

from sys import argv

script, filename = argv

print "We're going to erase %r." % filename
print "If you don't want that hit CTRL-C (^C)."
print "If you do want that, hit RETURN"

raw_input("?")

print "Opening the file..."
target = open(filename, 'w')

print "Truncating the file. Goodbye!"
target.truncate()

print "Now I'm going to ask you for three lines."

line1 = raw_input("line 1: ")
line2 = raw_input("line 2: ")
line3 = raw_input("line 3: ")

print "I'm going to write these to the file."

target.write(line1)
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)
target.write("\n")

print open(filename).read()

Answer 1

您需要致电target.close()ortarget.flush()以便新编写的内容可用于.read().