将变量的值输出到文本文件

Question

I am pretty new to python and need to output values read in by an SPI to a text file. I have a function to create the text file, and one to read the SPI but I am not sure how to get these two to interact with each other. I am familiar with the concept of "friends" in OOP but not how python treats separate functions in terms of how to create visibility. What I need is to pass the returned value of my SPI function to the create text function so that it can be stored.

def timeStamp(fname, fmt = '%Y%m%d--%H%M%S_{fname}'):                       
    return datetime.datetime.now().strftime(fmt).format(fname = fname)

with open (timeStamp('SPI_Inputs'), 'w') as output:     
        output.write('this needs to be adc output')

def readadc(adcnum):
    if adcnum > 7 or adcnum < 0:
        return -1
    r = spi.xfer2([1,8 + adcnum << 4,0])
    adcout = ((r[1] & 3) << 8) + r[2]
    return adcout   #this needs to be put into text file

while True:
    ADC_Val = int(round(readadc(0)/10.24))
    print "Input = ", ADC_Val
    count = count +1
    time.sleep (0.2)

    timeStamp(readadc))

Answer 1

I think that what you're trying to do is the following:

def timeStamp(fname, fmt = '%Y%m%d--%H%M%S_{fname}'):                       
    return datetime.datetime.now().strftime(fmt).format(fname = fname)

def write_to_file(str):
    with open (timeStamp('SPI_Inputs'), 'w') as output:     
        output.write(str)

def readadc(adcnum):
    if adcnum > 7 or adcnum < 0:
        return -1
    r = spi.xfer2([1,8 + adcnum << 4,0])
    adcout = ((r[1] & 3) << 8) + r[2]
    return adcout   #this needs to be put into text file

while True:
    ADC_Val = int(round(readadc(0)/10.24))
    write_to_file(ADC_Val)
    print "Input = ", ADC_Val
    time.sleep (0.2)
    print timeStamp(readadc))