Python Language, Using "subprocess" module control process

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import subprocess,os
child = subprocess.Popen(["ping","-c","10","www.google.com"])
child.wait() # key man

print("parent process")
os.system("rm iperf2-client.bat")

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error message : configparser.InterpolationSyntaxError: '%' must be followed by '%' or '(', found: "%)']/following::android.widget.EditText"

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 In general analysis, the last sentence is the key point: When reading the configuration file config.ini, there are % caused by   Solution one: Most likely configparser is reading the literal "%" sign in the string. The '%' symbol is used for string interpolation (substitution). If you want to use a literal "%", you can escape it with another "%". For example, use "100%%" to mean "100%" in configuration variables read by configparser. Solution two: Change from cf= configparser.ConfigParser() to ： cf = configparser.RawConfigParser()
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OSError: [Errno 22] Invalid argument:

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1 .  Error message : File "tarfile.py", line 2155, in makefile with bltn_open(targetpath, "wb") as target:  OSError: [Errno 22] Invalid argument:  This looks like a windows problem as colons in filenames are reserved characters in Windows. We don't like the idea of renaming the actual file for the sake of supporting in Windows. We will look into alternatives and track this as an enhancement separately.  2.  Edit tarfile.py :  You should add a line in 2155  # targetpath_s = targetpath.replace(':','-')
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