如何在文本文件上编写控制台输出 [英] How to write console output on text file
问题描述
我是编程新手,我在网页上搜索了这个问题的答案,并尝试了很多可能性,但都没有成功.我目前已设法将电位计连接到我的树莓派并在控制台上获取值,但我不知道如何将这些值保存到文本文件中.这是我的代码:
I am new to programming and I've searched the webpage for the answer to this question and have tried many possibilities without success. I have currently managed to connect a potentiometer to my raspberry and get values on the console, but I don't know how to save these values onto a text file. This is my code:
#!/usr/bin/python
import spidev
import time
#Define Variables
delay = 0.5
ldr_channel = 0
#Create SPI
spi = spidev.SpiDev()
spi.open(0, 0)
def readadc(adcnum):
# read SPI data from the MCP3008, 8 channels in total
if adcnum > 7 or adcnum < 0:
return -1
r = spi.xfer2([1, 8 + adcnum << 4, 0])
data = ((r[1] & 3) << 8) + r[2]
return data
while True:
ldr_value = readadc(ldr_channel)
print ('---------------------------------------')
print("LDR Value: %d" % ldr_value)
time.sleep(delay)
file = open('data.txt','w')
file.write("LDR Value: %d" % ldr_value)
file.close()`
从代码中可以看出,我可以将最后一个值获取到 data.txt 中,但不能及时获取所有值.非常感谢您,我很抱歉我的noobness"
As you can see from the code, I can get the last value onto data.txt, but not all the values in time. Thank you very much in advance and I am sorry for my "noobness"
推荐答案
当您在终端中执行文件时,您可以将此脚本的输出重定向到这样的文件:
When you execute a file in the terminal, you can redirect the outputs of this script to a file like this:
$ python script.py > /the/path/to/your/file
在 Python 中,您只需将 sys.stdout
设置为一个文件,然后所有打印将被重定向到 /the/path/to/your/file
.
In Python you just have to set the sys.stdout
to a file and then, all the prints will be redirected to /the/path/to/your/file
.
import sys
sys.stdout = open('/the/path/to/your/file', 'w')
并且不要忘记在脚本末尾关闭文件;)
and do not forget to close the file at the end of your script ;)
sys.stdout.close()
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