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Q&A Tips for golfing in Python

Reorder expressions in order to save whitespace Consider the following code: if c=='U':c='X' The space between if and c obviously cannot be removed, as that would merge them to the identifier ...

posted 3y ago by celtschk‭  ·  edited 3y ago by celtschk‭

Answer
#3: Post edited by user avatar celtschk‭ · 2021-09-12T18:19:31Z (over 3 years ago)
Added example noted by @user
  • # Reorder expressions in order to save whitespace
  • Consider the following code:
  • ```
  • if c=='U':c='X'
  • ```
  • The space between `if` and `c` obviously cannot be removed, as that would merge them to the identifier `ifc`. However by reversing the order of the arguments to `==`, the space becomes removable:
  • ```
  • if'U'==c:c='X'
  • ```
  • # Reorder expressions in order to save whitespace
  • Consider the following code:
  • ```
  • if c=='U':c='X'
  • ```
  • The space between `if` and `c` obviously cannot be removed, as that would merge them to the identifier `ifc`. However by reversing the order of the arguments to `==`, the space becomes removable:
  • ```
  • if'U'==c:c='X'
  • ```
  • As [user](https://codegolf.codidact.com/users/53837) noted [in the comments](https://codegolf.codidact.com/comments/thread/4477#comment-13560), another place where whitespace can be saved is between a number and a following keyword. For example, in
  • ```
  • if 2+x in{a,b,c}:x=0
  • ```
  • the space between `x` and `in` cannot be simply removed. However reordering the sum allows to remove it anyway:
  • ```
  • if x+2in{a,b,c}:x=0
  • ```
#2: Post edited by user avatar celtschk‭ · 2021-09-12T06:31:00Z (over 3 years ago)
  • # Reorder expressions in order to save whitespace
  • Consider the following code:
  • ```
  • if c=='U':c='X'
  • ```
  • The space between `if` and `c` obviously cannot be removed, as that would merge them to the identifier `ifc`. However by reversing the order of the arguments to `==`, the space becomes removable:
  • ```
  • if'U'==C:c='X'
  • ```
  • # Reorder expressions in order to save whitespace
  • Consider the following code:
  • ```
  • if c=='U':c='X'
  • ```
  • The space between `if` and `c` obviously cannot be removed, as that would merge them to the identifier `ifc`. However by reversing the order of the arguments to `==`, the space becomes removable:
  • ```
  • if'U'==c:c='X'
  • ```
#1: Initial revision by user avatar celtschk‭ · 2021-09-12T06:30:26Z (over 3 years ago)
# Reorder expressions in order to save whitespace

Consider the following code:
```
if c=='U':c='X'
```
The space between `if` and `c` obviously cannot be removed, as that would merge them to the identifier `ifc`. However by reversing the order of the arguments to `==`, the space becomes removable:
```
if'U'==C:c='X'
```