英文:
Python shell script cannot be executed with source command
问题
我想使用`subprocess.Popen()`从Python脚本中调用一个bash脚本。调用shell脚本作为可执行文件是有效的，但是使用`source`命令则不行。为什么？
***test_python.py***文件：
```python
import sys
import os
import subprocess
os.putenv("testvar", "testvalue")
test = subprocess.Popen("./test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen(". test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen("source test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen("/bin/bash test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen("/bin/sh test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test_shell.sh文件：
#!/bin/bash
echo "$testvar"
python test_python.py的输出：
('testvalue\n', '')
('', '/bin/sh: .: test_shell.sh: 无法打开文件 [文件或目录不存在]\n')
('', '/bin/sh: .: test_shell.sh: 无法打开文件 [文件或目录不存在]\n')
('testvalue\n', '')
('testvalue\n', '')
英文:
I want to call a bash script from a python script using subprocess.Popen(). Calling the shell script as an executable works, but sourceing it does not. Why?
File test_python.py:
import sys
import os
import subprocess
os.putenv("testvar", "testvalue")
test = subprocess.Popen("./test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen(". test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen("source test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen("/bin/bash test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
test = subprocess.Popen("/bin/sh test_shell.sh", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
print(test)
File test_shell.sh:
#!/bin/bash
echo "$testvar"
Output of python test_python.py:
('testvalue\n', '')
('', '/bin/sh: .: test_shell.sh: cannot open [No such file or directory]\n')
('', '/bin/sh: .: test_shell.sh: cannot open [No such file or directory]\n')
('testvalue\n', '')
('testvalue\n', '')
答案1
得分: 1
调用shell脚本作为可执行文件是有效的，但作为源码是无效的。
你正在调用
./test_shell.sh。然而，你使用test_shell.sh作为源码。为什么？
因为在PATH中没有这样的脚本。
如果你想要源码
./test_shell.sh，那么应该使用source ./test_shell.sh而不是source test_shell.sh。
英文:
> Calling the shell script as an executable works, sourceing it does not.
You are calling ./test_shell.sh. Yet, you source test_shell.sh.
> Why?
Because there is no such script in PATH
If you want to source ./test_shell.sh then source ./test_shell.sh not source test_shell.sh.
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