diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index 5b7c10605..820396c0d 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -553,7 +553,7 @@ def display_help(exit_code):
     if IS_WINDOWS:
         print("  -n, --nodotnet                do not generate Microsoft.Z3.dll make rules.")
     if IS_WINDOWS:
-	print("  --optimize                    generate optimized code during linking.")
+        print("  --optimize                    generate optimized code during linking.")
     print("  -j, --java                    generate Java bindings.")
     print("  --ml                          generate OCaml bindings.")
     print("  --staticlib                   build Z3 static library.")    
@@ -621,8 +621,8 @@ def parse_options():
             DOTNET_ENABLED = False
         elif opt in ('--staticlib'):
             STATIC_LIB = True
-	elif opt in ('--optimize'):
-	    OPTIMIZE = True
+        elif opt in ('--optimize'):
+            OPTIMIZE = True
         elif not IS_WINDOWS and opt in ('-p', '--prefix'):
             PREFIX = arg
             PYTHON_PACKAGE_DIR = os.path.join(PREFIX, 'lib', 'python%s' % distutils.sysconfig.get_python_version(), 'dist-packages')
@@ -1786,8 +1786,8 @@ def mk_config():
                     'SLINK_EXTRA_FLAGS=/link /DEBUG /MACHINE:X64 /SUBSYSTEM:WINDOWS /INCREMENTAL:NO /STACK:8388608 /OPT:REF /OPT:ICF /TLBID:1 /DYNAMICBASE:NO\n')
         else:
             # Windows Release mode
-	    if OPTIMIZE:
-		config.write('AR_FLAGS=/nologo /LTCG\n')                
+            if OPTIMIZE:
+                config.write('AR_FLAGS=/nologo /LTCG\n')
             config.write(
                 'LINK_FLAGS=/nologo /MD\n'
                 'SLINK_FLAGS=/nologo /LD\n')
diff --git a/src/api/python/z3util.py b/src/api/python/z3util.py
index 6cdd4de32..e0e9aba32 100644
--- a/src/api/python/z3util.py
+++ b/src/api/python/z3util.py
@@ -210,18 +210,18 @@ def prove(claim,assume=None,verbose=0):
 
 
     if verbose >= 2:
-        print 'assume: '
-        print assume
-        print 'claim: '
-        print claim
-        print 'to_prove: '
-        print to_prove
+        print('assume: ')
+        print(assume)
+        print('claim: ')
+        print(claim)
+        print('to_prove: ')
+        print(to_prove)
 
     f = Not(to_prove)
 
     models = get_models(f,k=1)
     if models is None: #unknown
-        print 'E: cannot solve !'
+        print('E: cannot solve !')
         return None, None
     elif models == False: #unsat
         return True,None   
@@ -458,7 +458,7 @@ def model_str(m,as_str=True):
 
     if m :
         vs = [(v,m[v]) for v in m]
-        vs = sorted(vs,key=lambda (a,_): str(a)) 
+        vs = sorted(vs,key=lambda a,_: str(a))
         if as_str:
             return '\n'.join(['{} = {}'.format(k,v) for (k,v) in vs])
         else: