This hasn't been implemented yet. There was a lot of discussion on parsing back during the GSoC selection period. See https://github.com/sympy/sympy/wiki/parsing.
Note also that there's some ambiguity depending on how smart you want to be. Should √a*b parse as sqrt(a)*b or sqrt(a*b)? The same for √ab. I would expect √a*b to parse as sqrt(a)*b and √ab to parse as sqrt(ab) (where ab is one Symbol named ab). If you agree with that, then I think this can be done with a simple regular expression. If √ is followed by a (, just replace it with "sqrt". If it is followed by a chain of letters, numbers, or underscores, replace it with sqrt and put parentheses around the letters, numbers, and underscores. Otherwise, it is a syntax error. This can be done easily with a regular expression search and replace, like √\( -> sqrt\( √([a-zA-Z0-9_]+) -> sqrt\(\1\) And then after doing those replacements, if the string still contains √, there is an error. I didn't test this, so there may be a typo. Also, depending on what variant of regular expressions you use, you may have to swap parentheses and escaped parentheses. Aaron Meurer Fri, May 11, 2012 at 7:56 AM, gsagrawal <[email protected]> wrote: > By any chance if in a string i have unicode of symbols like square root and > than expression , can sympy parse it ?? > > I am trying this in following way > . if expression is like √(a+b) its easy . i can jusr replace √ with sqrt > ..and this will work , > but in case like √2 or √a*b or √ab or √a_1 or √23 or √2+3 need to go for > regex and than do the parsing. > > Just thinking if this is already implemented or any other/easy way to do > this ? > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
