Python: SyntaxError: 'return' outside of function
Python: SyntaxError: 'return' outside of function
我搜索并阅读了很多关于此的帖子并阅读了解决方案。基本上我所看到的是它归结为缩进。我已经尝试了所有的建议，但我仍然收到关于 'return' 超出功能的错误。在 'return temp_c, temp_f' 有什么想法吗？
# RasPi Temperature Sensor - Beginning Sensor Networks
#
# For this script, we explore connecting a digital temperature sensor
# to the Raspberry Pi and reading the data. We display the
# temperature
# in Celsius and Fahrenheit.
# Import Python modules (always list in alphabetical order)
import glob
import os
import time
# Issue the modprobe statements to initialize the GPIO and
# temperature sensor modules
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
# Use glob to search the file system for directories that match the
# prefix.
# Save the path to the directory.
datadir = glob.glob('/sys/bus/w1/devices/28*')[0]
# Create the full path to the file
datafile = os.path.join(datadir, 'w1_slave')
# Procedure for reading the raw data from the file.
# Open the file and read all of the lines then close it.
def read_data():
f = open(datafile, 'r')
lines = f.readlines()
f.close()
return lines
# Read the temperature and return the values found.
def get_temp():
# Initialize the variables.
temp_c = None
temp_f = None
lines = read_data()
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
# Main loop. Read data then sleep 1 second until cancelled with CTRL-
# C.
while True:
temp_c, temp_f = get_temp()
print("Temperature is {0} degrees Celsius, "
"{1} degrees Fahrenheit.".format(temp_c, temp_f))
time.sleep(1)
您需要缩进 lines = read_data() 到 return temp_c, temp_f 之间的所有内容。
# RasPi Temperature Sensor - Beginning Sensor Networks
#
# For this script, we explore connecting a digital temperature sensor
# to the Raspberry Pi and reading the data. We display the
# temperature
# in Celsius and Fahrenheit.
# Import Python modules (always list in alphabetical order)
import glob
import os
import time
# Issue the modprobe statements to initialize the GPIO and
# temperature sensor modules
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
# Use glob to search the file system for directories that match the
# prefix.
# Save the path to the directory.
datadir = glob.glob('/sys/bus/w1/devices/28*')[0]
# Create the full path to the file
datafile = os.path.join(datadir, 'w1_slave')
# Procedure for reading the raw data from the file.
# Open the file and read all of the lines then close it.
def read_data():
f = open(datafile, 'r')
lines = f.readlines()
f.close()
return lines
# Read the temperature and return the values found.
def get_temp():
# Initialize the variables.
temp_c = None
temp_f = None
lines = read_data()
# <<<<<<<<<<<<<<< I INDENTED FROM HERE... <<<<<<<<<<<<<<<
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
# <<<<<<<<<<<<<<< ... TO HERE <<<<<<<<<<<<<<<
# Main loop. Read data then sleep 1 second until cancelled with CTRL-
# C.
while True:
temp_c, temp_f = get_temp()
print("Temperature is {0} degrees Celsius, "
"{1} degrees Fahrenheit.".format(temp_c, temp_f))
time.sleep(1)
def get_temp():
temp_c = None
temp_f = None
lines = read_data()
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
缩进如果有帮助
这是正确缩进的代码版本。您还混用了制表符和 4 个空格，应该避免这种情况，因为它经常会导致问题。
# RasPi Temperature Sensor - Beginning Sensor Networks
#
# For this script, we explore connecting a digital temperature sensor
# to the Raspberry Pi and reading the data. We display the
# temperature
# in Celsius and Fahrenheit.
# Import Python modules (always list in alphabetical order)
import glob
import os
import time
# Issue the modprobe statements to initialize the GPIO and
# temperature sensor modules
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
# Use glob to search the file system for directories that match the
# prefix.
# Save the path to the directory.
datadir = glob.glob('/sys/bus/w1/devices/28*')[0]
# Create the full path to the file
datafile = os.path.join(datadir, 'w1_slave')
# Procedure for reading the raw data from the file.
# Open the file and read all of the lines then close it.
def read_data():
f = open(datafile, 'r')
lines = f.readlines()
f.close()
return lines
# Read the temperature and return the values found.
def get_temp():
# Initialize the variables.
temp_c = None
temp_f = None
lines = read_data()
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
# Main loop. Read data then sleep 1 second until cancelled with CTRL-
# C.
while True:
temp_c, temp_f = get_temp()
print("Temperature is {0} degrees Celsius, "
"{1} degrees Fahrenheit.".format(temp_c, temp_f))
time.sleep(1)
我搜索并阅读了很多关于此的帖子并阅读了解决方案。基本上我所看到的是它归结为缩进。我已经尝试了所有的建议，但我仍然收到关于 'return' 超出功能的错误。在 'return temp_c, temp_f' 有什么想法吗？
# RasPi Temperature Sensor - Beginning Sensor Networks
#
# For this script, we explore connecting a digital temperature sensor
# to the Raspberry Pi and reading the data. We display the
# temperature
# in Celsius and Fahrenheit.
# Import Python modules (always list in alphabetical order)
import glob
import os
import time
# Issue the modprobe statements to initialize the GPIO and
# temperature sensor modules
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
# Use glob to search the file system for directories that match the
# prefix.
# Save the path to the directory.
datadir = glob.glob('/sys/bus/w1/devices/28*')[0]
# Create the full path to the file
datafile = os.path.join(datadir, 'w1_slave')
# Procedure for reading the raw data from the file.
# Open the file and read all of the lines then close it.
def read_data():
f = open(datafile, 'r')
lines = f.readlines()
f.close()
return lines
# Read the temperature and return the values found.
def get_temp():
# Initialize the variables.
temp_c = None
temp_f = None
lines = read_data()
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
# Main loop. Read data then sleep 1 second until cancelled with CTRL-
# C.
while True:
temp_c, temp_f = get_temp()
print("Temperature is {0} degrees Celsius, "
"{1} degrees Fahrenheit.".format(temp_c, temp_f))
time.sleep(1)
您需要缩进 lines = read_data() 到 return temp_c, temp_f 之间的所有内容。
# RasPi Temperature Sensor - Beginning Sensor Networks
#
# For this script, we explore connecting a digital temperature sensor
# to the Raspberry Pi and reading the data. We display the
# temperature
# in Celsius and Fahrenheit.
# Import Python modules (always list in alphabetical order)
import glob
import os
import time
# Issue the modprobe statements to initialize the GPIO and
# temperature sensor modules
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
# Use glob to search the file system for directories that match the
# prefix.
# Save the path to the directory.
datadir = glob.glob('/sys/bus/w1/devices/28*')[0]
# Create the full path to the file
datafile = os.path.join(datadir, 'w1_slave')
# Procedure for reading the raw data from the file.
# Open the file and read all of the lines then close it.
def read_data():
f = open(datafile, 'r')
lines = f.readlines()
f.close()
return lines
# Read the temperature and return the values found.
def get_temp():
# Initialize the variables.
temp_c = None
temp_f = None
lines = read_data()
# <<<<<<<<<<<<<<< I INDENTED FROM HERE... <<<<<<<<<<<<<<<
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
# <<<<<<<<<<<<<<< ... TO HERE <<<<<<<<<<<<<<<
# Main loop. Read data then sleep 1 second until cancelled with CTRL-
# C.
while True:
temp_c, temp_f = get_temp()
print("Temperature is {0} degrees Celsius, "
"{1} degrees Fahrenheit.".format(temp_c, temp_f))
time.sleep(1)
def get_temp():
temp_c = None
temp_f = None
lines = read_data()
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
缩进如果有帮助
这是正确缩进的代码版本。您还混用了制表符和 4 个空格，应该避免这种情况，因为它经常会导致问题。
# RasPi Temperature Sensor - Beginning Sensor Networks
#
# For this script, we explore connecting a digital temperature sensor
# to the Raspberry Pi and reading the data. We display the
# temperature
# in Celsius and Fahrenheit.
# Import Python modules (always list in alphabetical order)
import glob
import os
import time
# Issue the modprobe statements to initialize the GPIO and
# temperature sensor modules
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
# Use glob to search the file system for directories that match the
# prefix.
# Save the path to the directory.
datadir = glob.glob('/sys/bus/w1/devices/28*')[0]
# Create the full path to the file
datafile = os.path.join(datadir, 'w1_slave')
# Procedure for reading the raw data from the file.
# Open the file and read all of the lines then close it.
def read_data():
f = open(datafile, 'r')
lines = f.readlines()
f.close()
return lines
# Read the temperature and return the values found.
def get_temp():
# Initialize the variables.
temp_c = None
temp_f = None
lines = read_data()
# If the end of the first line ends with something other than
# 'YES'
# Try reading the file again until 'YES' is found.
while not lines[0].strip().endswith('YES'):
time.sleep(0.25)
lines = read_data()
# Search the second line for the data prefixed with 't='
pos = lines[1].find('t=')
# A return code of -1 means it wasn't found.
if pos != -1:
# Get the raw data located after the 't=' until the end of the
temp_string = lines[1][ pos+2:]
# Convert the scale for printing
temp_c = float(temp_string) / 1000.00
# Convert to Farenheit
temp_f = temp_c * 9.00 / 5.00 + 32.00
return temp_c, temp_f
# Main loop. Read data then sleep 1 second until cancelled with CTRL-
# C.
while True:
temp_c, temp_f = get_temp()
print("Temperature is {0} degrees Celsius, "
"{1} degrees Fahrenheit.".format(temp_c, temp_f))
time.sleep(1)