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54 | <H3><A NAME="SECTION008836000000000000000"> | |
55 | 6.8.3.6 Replacing popen2.*</A> | |
56 | </H3> | |
57 | ||
58 | <P> | |
59 | <span class="note"><b class="label">Note:</b> | |
60 | If the cmd argument to popen2 functions is a string, the command | |
61 | is executed through /bin/sh. If it is a list, the command is directly | |
62 | executed.</span> | |
63 | ||
64 | <P> | |
65 | <div class="verbatim"><pre> | |
66 | (child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode) | |
67 | ==> | |
68 | p = Popen(["somestring"], shell=True, bufsize=bufsize, | |
69 | stdin=PIPE, stdout=PIPE, close_fds=True) | |
70 | (child_stdout, child_stdin) = (p.stdout, p.stdin) | |
71 | </pre></div> | |
72 | ||
73 | <P> | |
74 | <div class="verbatim"><pre> | |
75 | (child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize, mode) | |
76 | ==> | |
77 | p = Popen(["mycmd", "myarg"], bufsize=bufsize, | |
78 | stdin=PIPE, stdout=PIPE, close_fds=True) | |
79 | (child_stdout, child_stdin) = (p.stdout, p.stdin) | |
80 | </pre></div> | |
81 | ||
82 | <P> | |
83 | The popen2.Popen3 and popen3.Popen4 basically works as subprocess.Popen, | |
84 | except that: | |
85 | ||
86 | <P> | |
87 | ||
88 | <UL> | |
89 | <LI>subprocess.Popen raises an exception if the execution fails | |
90 | ||
91 | <P> | |
92 | </LI> | |
93 | <LI>the <var>capturestderr</var> argument is replaced with the <var>stderr</var> | |
94 | argument. | |
95 | ||
96 | <P> | |
97 | </LI> | |
98 | <LI>stdin=PIPE and stdout=PIPE must be specified. | |
99 | ||
100 | <P> | |
101 | </LI> | |
102 | <LI>popen2 closes all file descriptors by default, but you have to | |
103 | specify close_fds=True with subprocess.Popen. | |
104 | </LI> | |
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