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POString formatting with “{0:d}” doesn't convert to integer
 

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  1. POString formatting with “{0:d}” doesn't convert to integer
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    <p>This is about the same issue as in <a href="https://stackoverflow.com/questions/5627605/string-formatting-with-0d-format-gives-unknown-format-code-d-for-object-o">this question about floats</a>.</p> <p>When you've got a value that could get converted to an integer, the old <code>%d</code> would convert it, but format doesn't.</p> <pre><code>class MyIntegerTenClass: def __int__(self): return 10 def __str__(self): return 'ten' ten = MyIntegerTenClass() print '%d, %02X, %s' % (ten, ten, ten) # ok print '{0}'.format(ten) # ok print '{0:d}, {0:02X}'.format(ten) # ValueError: Unknown format code 'd' for object of type 'str' </code></pre> <p>Is there a way to modify the behaviour of format, without touching the class of the value to be formatted (without adding a <code>__format__</code> method to that class)?</p> <p>Edit: My goal is to get the formatting dependent on the format string, but not on the value. So if the format string says "d" or "x", convert the value to int and then to decimal or hexadecimal representation. If the format string says "s", convert it to string directly. As the old <code>%</code> did.</p> <p>Actually, I could even add a <code>__format__</code> method to the class of the value. But how do I check, in that method, if the given format specification is an integer format specification? Without reimplementing the format specification parser of the builtin format.</p> <p>Edit: Here's a solution with <code>__format__</code> and exceptions. Any better ideas?</p> <pre><code>class MyIntegerTenClass: def __int__(self): return 10 def __str__(self): return 'ten' def __format__(self, spec): fmt = '{0:%s}'%spec try: return fmt.format(str(self)) except: return fmt.format(int(self)) ten = MyIntegerTenClass() print '%d, %02X, %s' % (ten, ten, ten) # ok, prints "10, 0A, ten" print '{0:d}, {0:02X}, {0}'.format(ten) # ok, prints "10, 0A, ten" </code></pre>
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    1. COIt says ten is a string, you are trying to format it as a number.
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