MAINT: Apply ruff rule RUF019

RUF019 Unnecessary key check before dictionary access

Author: DimitriPapadopoulos

numpy/f2py/capi_maps.py

@@ -627,7 +627,7 @@ def routsign2map(rout):
                                 ln = k
                                 break
                     lcb_map[ln] = un[1]
-    elif 'externals' in rout and rout['externals']:
+    elif rout.get('externals'):
         errmess('routsign2map: Confused: function %s has externals %s but no "use" statement.\n' % (
             ret['name'], repr(rout['externals'])))
     ret['callprotoargument'] = getcallprotoargument(rout, lcb_map) or ''

numpy/f2py/crackfortran.py

@@ -2079,7 +2079,7 @@ def postcrack(block, args=None, tab=''):
     block = analyzecommon(block)
     block['vars'] = analyzevars(block)
     block['sortvars'] = sortvarnames(block['vars'])
-    if 'args' in block and block['args']:
+    if block.get('args'):
         args = block['args']
     block['body'] = analyzebody(block, args, tab=tab)
 
@@ -2095,7 +2095,7 @@ def postcrack(block, args=None, tab=''):
     if 'name' in block:
         name = block['name']
     # and not userisdefined: # Build a __user__ module
-    if 'externals' in block and block['externals']:
+    if block.get('externals'):
         interfaced = []
         if 'interfaced' in block:
             interfaced = block['interfaced']

numpy/f2py/use_rules.py

@@ -55,7 +55,7 @@ def buildusevars(m, r):
                     r['map'][k], k, revmap[r['map'][k]]))
             else:
                 revmap[r['map'][k]] = k
-    if 'only' in r and r['only']:
+    if r.get('only'):
         for v in r['map'].keys():
             if r['map'][v] in m['vars']: