Apply suggestions from code review

Co-authored-by: Jeong YunWon <youknowone@users.noreply.github.com>

Author: TheAnyKey

parser/src/fstring.rs

@@ -34,8 +34,7 @@ impl<'a> FStringParser<'a> {
                 // can be integrated better with the remainign code, but as a starting point ok
                 // in general I would do here a tokenizing of the fstrings to omit this peeking.
                 '!' if self.chars.peek() == Some(&'=') => {
-                    expression.push('!');
-                    expression.push('=');
+                    expression.push_str("!=");
                     self.chars.next();
                 }
 
@@ -74,8 +73,8 @@ impl<'a> FStringParser<'a> {
                         }
                     });
 
-                    let peek = self.chars.peek();
-                    if peek != Some(&'}') && peek != Some(&':') {
+                    if let Some(peek) = self.chars.peek() {
+                        if peek != '}' && peek != ':' {
                         return Err(ExpectedRbrace);
                     }
                 }
@@ -197,11 +196,9 @@ impl<'a> FStringParser<'a> {
                         }
                     }
                 }
-
                 ' ' if !pred_expression_text.is_empty() => {
                     trailing_seq.push(ch);
                 }
-
                 _ => {
                     expression.push(ch);
                 }
@@ -388,7 +385,6 @@ mod tests {
     #[test]
     fn test_parse_invalid_fstring() {
         assert_eq!(parse_fstring("{5!a"), Err(ExpectedRbrace));
-
         assert_eq!(parse_fstring("{5!a1}"), Err(ExpectedRbrace));
         assert_eq!(parse_fstring("{5!"), Err(ExpectedRbrace));
 

tests/snippets/fstrings.py

@@ -4,8 +4,7 @@
 import sys
 import platform
 if platform.python_implementation() == 'CPython':
-    assert sys.version_info.major == 3, 'Incompatible Python Version, expected CPython 3.8 or later'
-    assert sys.version_info.minor == 8, 'Incompatible Python Version, expected CPython 3.8 or later'
+    assert sys.version_info >= (3, 8), 'Incompatible Python Version, expected CPython 3.8 or later'
 elif platform.python_implementation == 'RustPython':
     # ok
     pass
@@ -169,4 +168,4 @@ def assertEqual(self, a,b):
 
 # self.assertEqual(f'X{x  =}Y', 'Xx  ='+x+'Y')
 # self.assertEqual(f'X{x=  }Y', 'Xx=  '+x+'Y')
-# self.assertEqual(f'X{x  =  }Y', 'Xx  =  '+x+'Y')
+# self.assertEqual(f'X{x  =  }Y', 'Xx  =  '+x+'Y')