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How to truncate a string using str.format in Python? Is it even possible?
There is a width parameter mentioned in the Format Specification Mini-Language:
format_spec ::= [[fill]align][sign][#][0][width][,][.precision][type] ... width ::= integer ... But specifying it apparently only works for padding, not truncating:
>>> '{:5}'.format('aaa') 'aaa ' >>> '{:5}'.format('aaabbbccc') 'aaabbbccc' So it's more a minimal width than width really.
I know I can slice strings, but the data I process here is completely dynamic, including the format string and the args that go in. I cannot just go and explicitly slice one.
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The other way to truncate a string is to use a rsplit() python function. rsplit() function takes the string, a delimiter value to split the string into parts, and it returns a list of words contained in the string split by the provided delimiter.
Use the String translate() method to remove all occurrences of a substring from a string in python.
You can remove a character from a Python string using replace() or translate(). Both these methods replace a character or string with a given value. If an empty string is specified, the character or string you select is removed from the string without a replacement.
Use .precision instead:
>>> '{:5.5}'.format('aaabbbccc') 'aaabb' According to the documentation of the Format Specification Mini-Language:
The precision is a decimal number indicating how many digits should be displayed after the decimal point for a floating point value formatted with
'f'and'F', or before and after the decimal point for a floating point value formatted with'g'or'G'. For non-number types the field indicates the maximum field size - in other words, how many characters will be used from the field content. The precision is not allowed for integer values.
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