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string) that is about to be executed.
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line: A new line of code is going to be executed.
call: A function is about to be called or another code block
is entered.
return: A function or other code block is about to return.
exception: An exception has occurred.
c_call: A C function is about to be called.
c_return: A C function has returned.
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� 7 }|S )a: Return a string with information about a stack entry.
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r � s zBreakpoint.__init__c C s> | j | jf}d| j| j< | j| �| � | j| s:| j|= dS )z�Delete the breakpoint from the list associated to a file:line.
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