我想在for循环中调用子进程，并将垂直线水平放在列表中，以便用逗号分隔打印它们。 我的代码是这样的;
import serial
import time
import subprocess #test
subprocess.call(['echo','I am Learning to use Subprocesses']) #when Using subprocess.call([*1,*2]) *1 is the first argument and it is the bash code, *2 is the opti$
ser = serial.Serial("/dev/ttyUSB0", 4800, timeout = 1)
file = open("/home/pi/GPSWIFIMODIFIED.csv", "a")
file.write('\n')
for i in range(0,50):
date = time.time()
val = ser.readline();
if val.find("GPGGA")==-1: continue
#### subprocess.call([iwlist, scan and the stuff
### iwlout = sys.stdout(((( output on the screen)))))) the output which iwlist wlan0 scan will put on the screen
### line = iwlout.readline()
### for j in range (1,40):
### if line.find("Cell +j")==-1:
#### mylistofwifi = [line.find("Address"),line.find("Quality"),line.find("IEEE"),line.find("Pairwise")]
#### ########################### ######Here there must be iwlist scan, and the gathering must be done
print >> file ,date,',',val[:42],',','WIFI DATA WILL BE HERE'# print mylistofwifi will be here
file.close()
此刻工作的线路逐行存储数据，我想要的是将我从iwlist扫描输出中选择的线路添加到有时间的线路末端和GPGGA数据。
问题是我是Python的新手，我无法有效地使用列表或解析或子进程。
任何建议都将不胜感激，谢谢。
sudo wlan0 iwlist扫描的输出：
Cell 01 - Address: 00:26:99:4D:0F:34
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=18/100 Signal level=18/100
Encryption key:on
ESSID:"STAFF"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000000db0b79259
Extra: Last beacon: 0ms ago
IE: Unknown: 00055354414646
IE: Unknown: 010882040B0C12161824
IE: Unknown: 03010B
IE: Unknown: 0706494520010D14
IE: Unknown: 0B0504000E8D5B
IE: Unknown: 2A0100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (2) : 802.1x Proprietary
IE: Unknown: 32043048606C
IE: Unknown: 851E06008F000F00FF03590045452D472D303100000000000000000004000027
IE: Unknown: 9606004096000E00
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD050040961401
Cell 02 - Address: 00:26:99:4D:0D:35
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=21/100 Signal level=21/100
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000001021e097bd4
Extra: Last beacon: 0ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B0C12961824
IE: Unknown: 03010B
IE: Unknown: 0706494520010D14
IE: Unknown: 0B0503000C8D5B
IE: Unknown: 2A0100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (2) : 802.1x Proprietary
IE: Unknown: 32043048606C
IE: Unknown: 851E02008F000F00FF03590045452D472D303200000000000000000003000027
IE: Unknown: 9606004096000B00
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (2) : 802.1x Proprietary
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD050040961401
Cell 03 - Address: 00:26:99:4D:0D:30
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=21/100 Signal level=21/100
Encryption key:on
ESSID:"CONF"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000001021e0e36dd
Extra: Last beacon: 0ms ago
IE: Unknown: 0004434F4E46
IE: Unknown: 010882848B0C12961824
IE: Unknown: 03010B
IE: Unknown: 0706494520010D14
IE: Unknown: 0B0503000C8D5B
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: 851E02008F000F00FF03590045452D472D303200000000000000000003000027
IE: Unknown: 9606004096000B00
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD06004096010104
IE: Unknown: DD050040960305
IE: Unknown: DD050040960B09
IE: Unknown: DD050040961400
在没有subprocess.call([iwlist and the stuff的情况下运行文件的输出（不包括注释行）
1407868084.56 , $GPGGA,104023.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868085.21 , $GPGGA,104024.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868086.21 , $GPGGA,104025.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868087.62 , $GPGGA,104026.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868088.25 , $GPGGA,104027.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868089.21 , $GPGGA,104028.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868090.21 , $GPGGA,104029.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868091.2 , $GPGGA,104030.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
1407868092.61 , $GPGGA,104031.000,5323.0922,N,00636.1480,W , WIFI DATA WILL BE HERE
答案 0 :(得分：0)
您可以使用subprocess.check_output获取流程的输出：
from subprocess import check_output
iwout = check_output(['wlan0', 'iwlist', 'scan']).splitlines()
然后当你打印时：
print >> file, date, ',', val[:42], ',', ', '.join(iwout)
您可以将iwout替换为map(strip, iwout)以删除不必要的空格。
正如您所看到的，我删除了sudo，因为它可能阻止执行请求密码，您不应在脚本中包含sudo调用，除非它们是交互式的，否则您应该使用root权限运行所有命令，然后执行所有不带sudo的调用。