如何在Python中使用不同的名称创建多个文件

Question

I need create multiple files with different names but I recive data each seconds then I need save this data in each file with diferent names but my only code makes a file and when you receive another data this over write the existing file and not create another.

This is my code:

name= datetime.utcnow().strftime('%Y-%m-%d %H_%M_%S.%f')[:-3]
   filename = "Json/%s.json"% name

def get_json():
    if not os.path.exists(os.path.dirname(filename)):
                try:
                    os.makedirs(os.path.dirname(filename))
                except OSError as exc: # Guard against race condition
                    if exc.errno != errno.EEXIST:
                        raise 
    with open(filename, "w") as f:
                f.write("Hello")

def net_is_up():
    while(1):
        response = os.system("ping -c 1 " + hostname)
        if response == 0:
            print "[%s] Network is up!" % time.strftime("%Y-%m-%d %H:%M:%S")
            #read_json()
            get_json()

        else: 
            print "[%s] Network is down :(" % time.strftime("%Y-%m-%d %H:%M:%S")

        time.sleep(60)

Answer 1

Move these lines inside the get_json function:

name = datetime.utcnow().strftime('%Y-%m-%d %H_%M_%S.%f')[:-3]
filename = "Json/%s.json"% name

As it stands now, filename is only calculated once, when you start this script. You need to do it each time you're going to save a file.

Answer 2

This is the answer:

def get_json():
    name= datetime.utcnow().strftime('%Y-%m-%d %H_%M_%S.%f')[:-3]
    filename = "Json/%s.json"% name
    if not os.path.exists(os.path.dirname(filename)):
                try:
                    os.makedirs(os.path.dirname(filename))
                except OSError as exc: # Guard against race condition
                    if exc.errno != errno.EEXIST:
                        raise 
    with open(filename, "w") as f:
                f.write("Hello")

def net_is_up():
    while(1):
        response = os.system("ping -c 1 " + hostname)
        if response == 0:
            print "[%s] Network is up!" % time.strftime("%Y-%m-%d %H:%M:%S")
            #read_json()
            get_json()

        else: 
            print "[%s] Network is down :(" % time.strftime("%Y-%m-%d %H:%M:%S")

        time.sleep(60)