我试图通过Raspbian和subprocess.call命令在Raspberry Pi上通过Python运行命令。具体来说，我正在尝试使用它来用相机拍摄照片，仅作记录，因为我可以使用raspistill并实现所需的输出，所以效果很好。
这是我的python代码：
#PROCEDURE TO TAKE PHOTO WITH DEFAULT CAMERA ON RASPBERRY PI
import subprocess
def pyraspistill(name):
subprocess.call(['/usr/bin/raspistill','-o',name + ".jpg"], shell=True)
pyraspistill("name")
但是，它没有使用给定的参数拍摄照片，只是列出了有关raspistill命令的信息。为什么？如何避免这种情况？
作为参考，这是它返回的内容（不，它也没有给出图像）：
george@raspberrypi:~ $ sudo python camera.py
raspistill Camera App v1.3.11
Runs camera for specific time, and take JPG capture at end if requested
usage: raspistill [options]
Image parameter commands
-?, --help : This help information
-w, --width : Set image width <size>
-h, --height : Set image height <size>
-q, --quality : Set jpeg quality <0 to 100>
-r, --raw : Add raw bayer data to jpeg metadata
-o, --output : Output filename <filename> (to write to stdout, use '-o -'). If not specified, no file is saved
-l, --latest : Link latest complete image to filename <filename>
-v, --verbose : Output verbose information during run
-t, --timeout : Time (in ms) before takes picture and shuts down (if not specified, set to 5s)
-th, --thumb : Set thumbnail parameters (x:y:quality) or none
-d, --demo : Run a demo mode (cycle through range of camera options, no capture)
-e, --encoding : Encoding to use for output file (jpg, bmp, gif, png)
-x, --exif : EXIF tag to apply to captures (format as 'key=value') or none
-tl, --timelapse : Timelapse mode. Takes a picture every <t>ms. %d == frame number (Try: -o img_%04d.jpg)
-fp, --fullpreview : Run the preview using the still capture resolution (may reduce preview fps)
-k, --keypress : Wait between captures for a ENTER, X then ENTER to exit
-s, --signal : Wait between captures for a SIGUSR1 or SIGUSR2 from another process
-g, --gl : Draw preview to texture instead of using video render component
-gc, --glcapture : Capture the GL frame-buffer instead of the camera image
-set, --settings : Retrieve camera settings and write to stdout
-cs, --camselect : Select camera <number>. Default 0
-bm, --burst : Enable 'burst capture mode'
-md, --mode : Force sensor mode. 0=auto. See docs for other modes available
-dt, --datetime : Replace output pattern (%d) with DateTime (MonthDayHourMinSec)
-ts, --timestamp : Replace output pattern (%d) with unix timestamp (seconds since 1970)
-fs, --framestart : Starting frame number in output pattern(%d)
-rs, --restart : JPEG Restart interval (default of 0 for none)
-gps, --gpsdexif : Apply real-time GPS information from gpsd as EXIF tags (requires libgps.so.22)
Preview parameter commands
-p, --preview : Preview window settings <'x,y,w,h'>
-f, --fullscreen : Fullscreen preview mode
-op, --opacity : Preview window opacity (0-255)
-n, --nopreview : Do not display a preview window
Image parameter commands
-sh, --sharpness : Set image sharpness (-100 to 100)
-co, --contrast : Set image contrast (-100 to 100)
-br, --brightness : Set image brightness (0 to 100)
-sa, --saturation : Set image saturation (-100 to 100)
-ISO, --ISO : Set capture ISO
-vs, --vstab : Turn on video stabilisation
-ev, --ev : Set EV compensation - steps of 1/6 stop
-ex, --exposure : Set exposure mode (see Notes)
-fli, --flicker : Set flicker avoid mode (see Notes)
-awb, --awb : Set AWB mode (see Notes)
-ifx, --imxfx : Set image effect (see Notes)
-cfx, --colfx : Set colour effect (U:V)
-mm, --metering : Set metering mode (see Notes)
-rot, --rotation : Set image rotation (0-359)
-hf, --hflip : Set horizontal flip
-vf, --vflip : Set vertical flip
-roi, --roi : Set region of interest (x,y,w,d as normalised coordinates [0.0-1.0])
-ss, --shutter : Set shutter speed in microseconds
-awbg, --awbgains : Set AWB gains - AWB mode must be off
-drc, --drc : Set DRC Level (see Notes)
-st, --stats : Force recomputation of statistics on stills capture pass
-a, --annotate : Enable/Set annotate flags or text
-3d, --stereo : Select stereoscopic mode
-dec, --decimate : Half width/height of stereo image
-3dswap, --3dswap : Swap camera order for stereoscopic
-ae, --annotateex : Set extra annotation parameters (text size, text colour(hex YUV), bg colour(hex YUV), justify, x, y)
-ag, --analoggain : Set the analog gain (floating point)
-dg, --digitalgain : Set the digital gain (floating point)
Notes
Exposure mode options :
off,auto,night,nightpreview,backlight,spotlight,sports,snow,beach,verylong,fixedfps,antishake,fireworks
Flicker avoid mode options :
off,auto,50hz,60hz
AWB mode options :
off,auto,sun,cloud,shade,tungsten,fluorescent,incandescent,flash,horizon
Image Effect mode options :
none,negative,solarise,sketch,denoise,emboss,oilpaint,hatch,gpen,pastel,watercolour,film,blur,saturation,colourswap,washedout,posterise,colourpoint,colourbalance,cartoon
Metering Mode options :
average,spot,backlit,matrix
Dynamic Range Compression (DRC) options :
off,low,med,high
Preview parameter commands
-gs, --glscene : GL scene square,teapot,mirror,yuv,sobel,vcsm_square
-gw, --glwin : GL window settings <'x,y,w,h'>
enter code here
答案 0 :(得分：0)
答案：
请勿使用shell = True，因为只有第一项将传递给命令，其他参数将作为参数传递给shell-@ juanpa.arrivillaga
非常感谢。我将其添加为结论问题的答案，因为这是一条评论：）