Merge pull request #26 from cclauss/patch-1

Travis CI: Lint Python code for syntax errors and warnings

.travis.yml

@@ -1,15 +1,12 @@
+os: linux
+dist: focal
 language: python
 python:
- - 3.7
-script: pytest --cov-report term --cov
+  - 3.7
 before_install:
- - "pip install -U pip"
- - "python setup.py install"
- - "pip install pytest-cov"
- - "pip install coverage[toml]"
- - "pip install coveralls"
- - "pip install nbconvert"
- - "pip install IPython"
-
-after_success:
- - "coveralls"
+  - pip install --upgrade pip
+  - python setup.py install
+  - pip install coverage[toml] coveralls flake8 IPython nbconvert pytest-cov
+before_script: flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+script: pytest --cov-report term --cov
+after_success: coveralls

handcalcs/handcalcs.py

@@ -1574,15 +1574,15 @@ def swap_frac_divs(code: deque) -> deque:
     close_bracket_token = False
     for index, item in enumerate(code):
         next_idx = min(index + 1, length - 1)
-        if code[next_idx] is "/" and isinstance(item, deque):
+        if code[next_idx] == "/" and isinstance(item, deque):
             new_item = f"{ops}{a}"
             swapped_deque.append(new_item)
             swapped_deque.append(swap_frac_divs(item))  # recursion!
-        elif code[next_idx] is "/" and not isinstance(item, deque):
+        elif code[next_idx] == "/" and not isinstance(item, deque):
             new_item = f"{ops}{a}"
             swapped_deque.append(new_item)
             swapped_deque.append(item)
-        elif item is "/":
+        elif item == "/":
             swapped_deque.append(f"{b}{a}")
             close_bracket_token = True
         elif close_bracket_token:
@@ -1670,9 +1670,9 @@ def swap_py_operators(pycode_as_deque: deque) -> deque:
             new_item = swap_py_operators(item)  # recursion!
             swapped_deque.append(new_item)
         else:
-            if item is "*":
+            if item == "*":
                 swapped_deque.append("\\cdot")
-            elif item is "%":
+            elif item == "%":
                 swapped_deque.append("\\bmod")
             else:
                 swapped_deque.append(item)

handcalcs/install_templates.py

@@ -3,7 +3,7 @@
 import shutil
 import nbconvert
 
-__all__ = ["install_latex_template", "install_html_template"]
+__all__ = ["install_latex", "install_html"]
 
 def install_latex(swap_in: str = "", swap_out: str = "article.tplx", restore: bool = False) -> None:
     """