blocks|key|5048426|text|你试过使用join吗？并在换行线上使用split+(\n)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5048427|#!/usr/bin/python
import+subprocess

CMD+=+"ls+-la"
output+=+subprocess.check_output(CMD,+shell=True)
lst+=+[]
for+char+in+output:
++++lst.append(char)
print+''.join(lst).split('\n')|code-block|syntax|javascript|5048428|基本上，将所有输出连接到一个字符串中，然后对换行符进行拆分，以创建单个输出的列表。另外，命名变量list也是错误的做法，因为这是Python中的一种类型。尝试使用lst或list1代替。|5048429|您还可以将其简化为：|5048430|#!/usr/bin/python
import+subprocess

CMD+=+"ls+-la"
output+=+subprocess.check_output(CMD,+shell=True)
print+output.split('\n')|5048431|由于subprocess.check_output()的返回值是作为单个字符串的输出，因此不需要遍历每个字符，只需在字符串上使用split获取输出列表。|5048432|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/2/library/stdtypes.html#str.join|1|https://docs.python.org/2/library/stdtypes.html#str.split|2|https://docs.python.org/2/library/subprocess.html#subprocess.check_output^0|5|4|J|5|Q|2|5|4|0|J|5|1|0|0|1C|4|29|3|2D|5|0|0|0|2|P|1S|5|2|P|2|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@$9|1B|A|1C|1|1D]|$9|1E|A|1F|1|1G]]|E|$]]|$1|F|3|G|5|H|7|1H|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1P|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|1Q|8|@]|D|@]|E|$I|J]]|$1|Q|3|R|5|6|7|1R|8|@$9|1S|A|1T|B|C]|$9|1U|A|1V|B|C]]|D|@$9|1W|A|1X|1|1Y]]|E|$]]|$1|S|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]|12|$5|V|W|X|E|$Y|13]]]]

Have you tried using <a href="https://docs.python.org/2/library/stdtypes.html#str.join" rel="nofollow"><code>join</code></a>? And use <a href="https://docs.python.org/2/library/stdtypes.html#str.split" rel="nofollow"><code>split</code></a> on newline (<code>\n</code>).

<pre><code>#!/usr/bin/python
import subprocess

CMD = "ls -la"
output = subprocess.check_output(CMD, shell=True)
lst = []
for char in output:
 lst.append(char)
print ''.join(lst).split('\n')
</code></pre>

Basically join all your output into a single string, and then split on the newline character to create a list of your individual outputs. Also it is bad practice to name a variable <code>list</code>, as this is a type in Python. Try using <code>lst</code> or <code>list1</code> instead.

You could also simplify it to:

<pre><code>#!/usr/bin/python
import subprocess

CMD = "ls -la"
output = subprocess.check_output(CMD, shell=True)
print output.split('\n')
</code></pre>

As the return value of <a href="https://docs.python.org/2/library/subprocess.html#subprocess.check_output" rel="nofollow"><code>subprocess.check_output()</code></a> is the output as a single string, there is no need to loop through each character, just use <code>split</code> on the string to get the list of outputs.

blocks|key|2225482|text|我并不是一个真正的蟒蛇，但这应该适用于你，而且看上去更清楚一些：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2225483|import+subprocess
cmd+=+["ls",+"-la"]
proc+=+subprocess.Popen(cmd,+stdout=subprocess.PIPE)
for+line+in+proc.stdout.readlines():
++++print+line|code-block|syntax|javascript|2225484|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I'm not really a python guy, but this should work for you and seems a bit clearer:

<pre><code>import subprocess
cmd = ["ls", "-la"]
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
for line in proc.stdout.readlines():
 print line
</code></pre>

blocks|key|2719409|text|@glenn-jackman和@都回答工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2719410|proc+=+subprocess.Popen(cmd,+stdout=subprocess.PIPE)
for+line+in+proc.stdout.readlines():
++++print+line|code-block|syntax|javascript|2719411|和|2719412|output+=+subprocess.check_output(CMD,+shell=True)
print+output.split('\n')|2719413|但是，我使用subprocess.Popen是因为它对管道很有用：|offset|length|style|BOLD|2719414|p1+=+subprocess.Popen(['ip','-la'],+stdout=subprocess.PIPE)
p2+=+subprocess.Popen(['grep','afile'],+stdin=p1.stdout,stdout=subprocess.PIPE)
p3+=+subprocess.Popen(['awk','{+print+$6;+}'],+stdin=p2.stdout,stdout=subprocess.PIPE)

output+=+p3.communicate()[0]

for+ln+in+output.split('\n'):
++++print+ln|2719415|entityMap^0|0|0|0|0|6|G|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@$M|Z|N|10|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Both @glenn-jackman and @tui-popenoe answers work:

<pre><code>proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
for line in proc.stdout.readlines():
 print line
</code></pre>

and 

<pre><code>output = subprocess.check_output(CMD, shell=True)
print output.split('\n')
</code></pre>

But, I used subprocess.Popen because it was useful for piping:

<pre><code>p1 = subprocess.Popen(['ip','-la'], stdout=subprocess.PIPE)
p2 = subprocess.Popen(['grep','afile'], stdin=p1.stdout,stdout=subprocess.PIPE)
p3 = subprocess.Popen(['awk','{ print $6; }'], stdin=p2.stdout,stdout=subprocess.PIPE)

output = p3.communicate()[0]

for ln in output.split('\n'):
 print ln
</code></pre>

blocks|key|2225556|text|不要使用proc.stdout.readlines()。它在返回之前读取所有输出。您需要使用proc.stdout。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2225557|这是yy.py|2225558|import+subprocess
cmd+=+["bash",+"./yy.sh"]

proc+=+subprocess.Popen(cmd,+stdout=subprocess.PIPE)
for+line+in+proc.stdout:
++++print(+line+)|code-block|syntax|javascript|2225559|这是yy.sh|2225560|for+a+in+1+2+3+4+5+6+7+8+9+0;+do
++++echo+"hi+$a+!!!"
++++sleep+1
done|2225561|当您运行yy.py时，您将逐行获得输出。|2225562|如果使用proc.stdout.readlines()，则等待10秒并获得所有输出。|2225563|entityMap^0|4|N|1A|B|0|2|5|0|0|2|5|0|0|4|5|0|4|N|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|V|$]]

Don't use <code>proc.stdout.readlines()</code>. This reads all OUTPUT before it returns. You need to use <code>proc.stdout</code>.
Here is <code>yy.py</code>:
<pre><code>import subprocess
cmd = [&quot;bash&quot;, &quot;./yy.sh&quot;]

proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
for line in proc.stdout:
 print( line )
</code></pre>
Here is <code>yy.sh</code>:
<pre><code>for a in 1 2 3 4 5 6 7 8 9 0; do
 echo &quot;hi $a !!!&quot;
 sleep 1
done
</code></pre>
When you run <code>yy.py</code> you get output line by line.
If you use <code>proc.stdout.readlines()</code>, you wait 10 seconds and get all output.

I need to read a shell command output from python script and fill a list with each line:

ISSUE:
If I save the command output as a variable, the loop cycle read it character-by-character

<pre><code>#!/usr/bin/python
import subprocess

CMD = "ls -la"
output = subprocess.check_output(CMD, shell=True)
list = []
for line in output:
 list.append(line)
print list
</code></pre>

Bad output:
['t', 'o', 't', 'a', 'l', ' ', '5',...]

WORKAROUND:
As a work around, I directed the comand output to a file, and from there read line-by-line:

<pre><code>#!/usr/bin/python
import subprocess

CMD = "ls -la &gt; tmp"
subprocess.call(CMD, shell=True)
list = []
f = open("tmp", "r")
for line in f:
 list.append(line)
print list
</code></pre>

Good output
['total 52\n', 'drwxrwxr-x 3 ajn ajn 4096 mars 11 17:52 .\n',...] 

QUESTION:
How can I use the 1st approach (no file manipulation ,all inside the program) with the result of the second approach?

Read shell output from python line-by-line

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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问逐行读取python的shell输出。
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问逐行读取python的shell输出。EN