DWQA QuestionsCategory: ProgramPython files running scratch
kaeruser asked 3 weeks ago

Write a summary, the program can run, no problem.
Climb down the body of 30 websites and save it as a JSON filetest.json
Iftest.jsonSave to a newtest1.json
A new Python file calledcheck.py, compare the hash values of the two files. If they are different, send an email to my mailbox.
In thischeck.pyThere is an os.system (scratch XXXX) in it
Here comes the question Because I want to run it regularly. For example, if I set a regular execution plan on win, it will be executed every 5 minutes. This is OK.
One problem is the same as on VPS. The system is CentOS 6.
For example, you can open this in the way of path at any placecheck.pyfile

python Documents/check_web/check.py
Scrapy 1.1.1 - no active project

Unknown command: crawl

Use "scrapy" to see available commands
Traceback (most recent call last):
  File "Documents/check_web/check.py", line 35, in <module>
    f1 = open("./test.json", "rb")
IOError: [Errno 2] No such file or directory: './test.json'

Check.py is roughly as follows

def getJson():
    os.system('scrapy crawl check_web_sprider')

def getHash(f):
    line = f.readline()
    hash = hashlib.md5()
    while (line):
        line = f.readline()
    return hash.hexdigest()

def IsHashEqual(f1, f2):
    str1 = getHash(f1)
    str2 = getHash(f2)
    return str1 == str2

if __name__ == '__main__':
    f1 = open("./test.json", "rb")
    f2 = open("./test1.json", "rb")

    if (IsHashEqual(f1, f2) is False):
        def _format_addr(s):
            name, addr = parseaddr(s)
            return formataddr(( \
                Header(name, 'utf-8').encode(), \
                addr.encode('utf-8') if isinstance(addr, unicode) else addr))

Ask why.. The way the path is displayed

Scrapy 1.1.1 - no active project

Unknown command: crawl

But if I go to check.py and

python check.py

There’s no problem.. Reptiles work as well..
I’m sorry that the writing is not very good. I hope someone can understand.. And know how to solve it.
Python files running scratch
check.pyIt’s in the project directory of scratch..
Python files running scratch

1 Answers
citaret answered 3 weeks ago

Path problems,crawlCommand needs to be inEngineering catalogueAnd run scripts in other paths,./test.jsonWill be saved in the current working directory.
First getAbsolute path

app_path = os.path.dirname(os.path.realpath(__file__))

To open a file:

f1 = open(os.path.join(app_path, "test.json"), "rb")

FunctionscapySuggested usesubprocess, try addingcwd=app_path, specify the working path.

kaeruser replied 3 weeks ago

Running check.py in the project directory of check will generate test.json and test1.json in the same level directory of check.py Then we can compare.. Actually, I don’t know why.. I’ll try the absolute path first