python - 执行此代码时出现python更大或更小的符号

我正在尝试将python数据插入mysql表中。我正在使用ds18b20温度传感器。我已经尝试了许多教程，但是我不明白如何将mysql添加到用于获取温度数据的python代码中。任何帮助，将不胜感激！现在，我更新了代码，缩进错误消失了。但是，当我执行此代码时，什么也没有发生，并且大于或小于python（>>>）符号是执行我的代码时唯一生成的东西。

这是python：

import os
import glob
import time
import MySQLdb
import datetime

i = datetime.datetime.now()

db = MySQLdb.connect(host = "localhost", user = "root", passwd = "test", db = "temp_pi")
cur = db.cursor()

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')

base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines

def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        temp_c = float(temp_string) / 1000.0
        temp_f = temp_c * 9.0 / 5.0 + 32.0
        return temp_c
    while True:
          print ("recording data into database(period = 5s.)....press ctrl+Z to stop!")

          valT = str(read_temp())

          year = str(i.year)
          month = str(i.month)
          day = str(i.day)
          date = day + "-" + month + "-" + year

          hour = str(i.hour)
          minute = str(i.minute)
          second = str(i.second)
          time = hour + ":" + minute + ":" + second

          try:
             cur.execute("""INSERT INTO TAB_CLASSROOM(temp_c,T_Date,T_Time) VALUES(%s,%s,%s)""",(valT,date,time))
             db.commit()
          except:
             db.rollback()

          time.sleep(10)

    cur.close()
    db.close()

最佳答案

import os
import glob
import time
import MySQLdb
import datetime

i = datetime.datetime.noW()

db = MySQLdb.connect(host = "localhost", user = "root", passwd = "test", db = "temp_pi")
cur = db.cursor()

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')

base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines

def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        temp_c = float(temp_string) / 1000.0
        temp_f = temp_c * 9.0 / 5.0 + 32.0
        return temp_c
    while True:
          print("recording data into database(period = 5s.)....press ctrl+Z to stop!")

          valT = str(read_temp())

          year = str(i.year)
          month = str(i.month)
          day = str(i.day)
          date = day + "-" + month + "-" + year

          hour = str(i.hour)
          minute = str(i.minute)
          second = str(i.second)
          timestring = hour + ":" + minute + ":" + second

          try:
             cur.execute("""INSERT INTO TAB_CLASSROOM(temp_c,rec_time,rec_date) VALUES(%s,%s,%s)""",(valT,timestring,date))
             db.commit()
          except:
             db.rollback()

          time.sleep(10)

cur.close()
db.close()

根据我的编辑，您的WHILE语句未正确缩进。根据pythonm的版本2.7或3.X，您可能需要一会儿，如果它是3.x，则需要在print语句周围加上（）。

关于python - 执行此代码时出现python更大或更小的符号，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/54101186/