python脚本输出和python控制台输出之间的差异
我有一个.py文件:python脚本输出和python控制台输出之间的差异,python,console,raw-input,Python,Console,Raw Input,我有一个.py文件: 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
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 "And finally, we close it."
target.close()
我不明白的是:
a) 为什么在解释器中,如果我写,raw\u input(“?”
),然后键入f
并按enter键,它会输出'f'
字符串,如果我运行.py文件,它不会返回'f'字符串
b) 此外,python文档说:“然后函数从输入中读取一行,将其转换为字符串(去掉尾随的换行符),并返回该字符串。那么,为什么第7行打印在新行而不是第6行(“打开文件…”)上呢。该\n
来自何处?a)默认情况下,解释器会打印命令的输出,但您的脚本不会这样做,除非您使用print
语句
print raw_input('?')
b) '\n'
不在从raw\u input
返回的字符串中,但当您按enter键时,控制台会捕获该字符串,因此这是使用raw\u input
时产生的副作用
print repr(raw_input('?')) # You'll get 'f', not 'f\n'
a) 它确实返回字符串,但您没有将其保存在变量中。在这种情况下,交互式解释器将回显该值
b) \n
可能是输入(您的键入)的一部分,但很难知道您的确切意思。您所说的“it not return me f”是什么意思?目标文件的编写与您预期的一样?