fixed many imports for transformation in parse_expr

[NtemKenyor]

• parsing
  • "Reduced the number of files imported before using parse_expr()"

• Changes

I worked on the parse_expr() making the end-user import less files.

Using parse_expr is now shorter.

Inline with this issue
"Make parse_expr with transformations easier to type #21226", I decided to help by making the parse_expr much more fun to use.

Before...(This was before i made the change)

from sympy.parsing.sympy_parser import standard_transformations, implicit_multiplication_application
transformations = (standard_transformations + (implicit_multiplication_application,))
parse_expr("2x + 1", transformations=transformations)
2*x + 1

After...(The code base right now)

parse_expr("2x + 1", transformations="all")
2*x + 1

I hope to improve it again based on more feedbacks.

I am here for Google Summer of code but I just felt "in-love" with sympy.

[sympy-bot]

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Here is what the release notes will look like:

• parsing
  • "Reduced the number of files imported before using parse_expr()" (#21229 by @NtemKenyor)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.8.

Click here to see the pull request description that was parsed.

<!-- BEGIN RELEASE NOTES -->

* parsing
  * "Reduced the number of files imported before using parse_expr()"

<!-- END RELEASE NOTES -->

* ## Changes

 I worked on the parse_expr() making the end-user import less files.

Using parse_expr is now shorter.

Inline with this issue
"Make parse_expr with transformations easier to type #21226", I decided to help by making the parse_expr much more fun to use.

Before...(This was before i made the change)

>>>from sympy.parsing.sympy_parser import standard_transformations, implicit_multiplication_application
>>> transformations = (standard_transformations + (implicit_multiplication_application,))
>>> parse_expr("2x + 1", transformations=transformations)
2*x + 1

After...(The code base right now)

>>> parse_expr("2x + 1", transformations="all")
2*x + 1

I hope to improve it again based on more feedbacks.

I am here for Google Summer of code but I just felt "in-love" with sympy.

[oscargus]

I think it makes sense to check that transformations really is "all" and not just a string.

Also, please update the documentation pointing out this option and add a test. The example you showed in the post works well as a test.