Question

基本上// Create a Pattern object Pattern pattern = Pattern.compile("PT(\\d+H)?(\\d+M)?(\\d+S)?"); // Now create matcher object. Matcher matcher = pattern.matcher(duracaoStr); int hour = 0; int minute = 0; int second = 0; if(matcher.matches()){ for(int i = 1; i<=matcher.groupCount();i++){ String group = matcher.group(i); int number = new Integer(group.substring(0, group.length()-1)); if(matcher.group(i).endsWith("H")){ hour = number; } else if(matcher.group(i).endsWith("M")){ minute = number; } else if(matcher.group(i).endsWith("S")){ second = number; } } }方法接受用户输入，检查并在用户未输入main时调用first方法。

quit方法检查输入的第一部分，并根据用户输入的内容调用其他方法之一。这是我得到错误的一点;例如，当first方法调用first方法时，我会收到form个异常。我对此有点困惑，因为我已经定义了每个方法，并且它们都拼写正确，当我调用NameError: name 'form' is not defined方法时，它完全正常。

主要方法：

quit

第一种方法：

if __name__ == '__main__':
        for line in sys.stdin:
                s = line.strip()
                if not s: break
                if (str(s) == "quit"): quit()
                elif (str(s) == "quit") == False:
                        a = s.split()
                        print(a)
                        if (len(a) is 2): first(a)
                        elif (len(a) is 3): first(a)
                        else: print("Invalid Input. Please Re-enter.")

其他方法（这些都是从第一种方法调用的）：

def first(a = list()):
        word = a[0]

        if word == "ls":
                ls(a[1])           
        elif word == "format":
                form(a[1])
        elif word == "reconnect":
                reconnect(a[1])
        elif word == "mkfile":
                mkfile(a[1])
        elif word == "mkdir":
                mkdir(a[1])
        elif word == "append":
                append(a[1], a[2])                               
        elif word == "delfile":
                delfile(a[1])
        elif word == "deldir":
                deldir(a[1])
        else:
                print("Invalid Prompt. Please Re-enter.")

Answer 1

这个错误是因为

    elif word == "format":
            form(a[1])

python基本上不知道是什么形式。

让我告诉你：

gaf@$[09:21:56]~> python
Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> form()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'form' is not defined
>>>

有两种方法

>>> def form():
...     pass
...
>>> form()
>>> form
<function form at 0x7f49d7f38a28>
>>>

或使用

从一些库中导入它

import

命令

也是订单也很重要

try:
    form()
except NameError:
    print('Oops name error raise above')


def form():
    print('form foo is called')

try:
    form()
except NameError:
    print('Oops name error raise below')

会给你

/home/gaf/dashboard/bin/python /home/gaf/PycharmProjects/dashboard/test.py
Oops name error raise above
form foo is called

Process finished with exit code 0

P.S。看看pep8 你的代码是一团糟％）但不用担心每个人用第一语言做什么

Answer 2

这取决于您是否使用python 2.7或3，但您的代码可以进行一些小的更改。

import sys
def reconnect(one=""):
    print("Reconnect")

def ls(one=""):
    print("list")

def mkfile(one=""):
    print("make file")

def mkdir(one=""):
    print("make drive")

def append(one="", two=""):
    print("append")

def form(one=""):
    print("format " + one)

def delfile(one=""):
    print("delete file")

def deldir(one=""):
    print("delete directory")

def quit():
    print("quit")
    sys.exit(0)

def first(a=list()):
    word = a[0]

    if word == "ls":
        ls(a[1])
    elif word == "format":
        form(a[1])
    elif word == "reconnect":
        reconnect(a[1])
    elif word == "mkfile":
        mkfile(a[1])
    elif word == "mkdir":
        mkdir(a[1])
    elif word == "append":
        append(a[1], a[2])
    elif word == "delfile":
        delfile(a[1])
    elif word == "deldir":
        deldir(a[1])
    else:
        print("Invalid Prompt. Please Re-enter.")

line = raw_input("Some input please: ")  # or `input("Some...` in python 3

print(line)
s = line.strip()

if (str(s) == "quit"):
    quit()
elif (str(s) == "quit") == False:
    a = s.split()
    print(a)
    if (len(a) is 2):
        first(a)
    elif (len(a) is 3):
        first(a)
    else:
        print("Invalid Input. Please Re-enter.")

测试

 python pyprog.py 
Some input please: ls text.txt
ls text.txt
['ls', 'text.txt']
list

您也可以尝试online。

NameError：未定义名称'form'（Python3）

2 个答案: