How do we pass default argument value to create thread object?

[Piyush Verma]

Hi,

I am using Thread class to create threads.
CODE
thread = threading.Thread(target=Fun, args=[arg1, arg2, arg3=val])
thread.start()
/CODE

This code is throwing compilation error(Ipython).
In [19]: import threading

In [20]: def Fun(agr1, arg2, arg3=None):
   : pass
   :

In [21]: thread = threading.Thread(target=Fun, args=[arg1, arg2, arg3=val
])

   File ipython console, line 1
 thread = threading.Thread(target=Fun, args=[arg1, arg2, arg3=val])
 ^
SyntaxError: invalid syntax

How do we pass the value to default arguments while creating thread object?

Regards,
~Piyush
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Re: How do we pass default argument value to create thread object?

[Jean-Michel Pichavant]

- Original Message - 

 Hi,

 I am using Thread class to create threads.
 CODE
 thread = threading.Thread(target=Fun, args=[arg1, arg2, arg3=val])
 thread.start()
 /CODE

 This code is throwing compilation error(Ipython).

 In [19]: import threading

 In [20]: def Fun(agr1, arg2, arg3=None):
 : pass
 :

 In [21]: thread = threading.Thread(target=Fun, args=[arg1, arg2,
 arg3=val ])
 
 File ipython console, line 1
 thread = threading.Thread(target=Fun, args=[arg1, arg2, arg3=val])
 ^
 SyntaxError: invalid syntax

 How do we pass the value to default arguments while creating thread
 object?

 Regards,
 ~Piyush
 Facebook Twitter

Hi,

try something like

thread = threading.Thread(target=Fun, args=(val1, val2), 
kwargs={arg3:val3})

This will call
Fun(val1, val2, arg3=val3)

Browse the python tutorial for details on arguments and keyword arguments.

Cheers,

JM


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Re: How do we pass default argument value to create thread object?

[Zachary Ware]

On Wed, Mar 12, 2014 at 8:09 AM, Piyush Verma 114piy...@gmail.com wrote:
 Hi,

 I am using Thread class to create threads.
 CODE
 thread = threading.Thread(target=Fun, args=[arg1, arg2, arg3=val])
 thread.start()
 /CODE

 This code is throwing compilation error(Ipython).
 In [19]: import threading

 In [20]: def Fun(agr1, arg2, arg3=None):
: pass
:

 In [21]: thread = threading.Thread(target=Fun, args=[arg1, arg2,
 arg3=val])
 
File ipython console, line 1
  thread = threading.Thread(target=Fun, args=[arg1, arg2, arg3=val])
  ^
 SyntaxError: invalid syntax

 How do we pass the value to default arguments while creating thread object?

Use the 'kwargs' argument:

   thread = threading.Thread(target=Fun, args=[1, 2], kwargs={'arg3': val})

See http://docs.python.org/3.4/library/threading#threading.Thread for more info.

Hope this helps,
-- 
Zach
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