Travis CI: Don’t allow bare exceptions (#1734)

* Travis CI: Don’t allow bare exceptions

* fixup! Format Python code with psf/black push

* except IOError:

* except IOError:

* Update hamming_code.py

* IndexError

* Get rid of the nonsense logic

Co-authored-by: John Law <johnlaw.po@gmail.com>

ciphers/transposition_cipher.py

@@ -1,11 +1,13 @@
 import math
 
-'''
+"""
 In cryptography, the TRANSPOSITION cipher is a method of encryption where the
 positions of plaintext are shifted a certain number(determined by the key) that
 follows a regular system that results in the permuted text, known as the encrypted
 text. The type of transposition cipher demonstrated under is the ROUTE cipher.
-'''
+"""
+
+
 def main():
     message = input("Enter message: ")
     key = int(input("Enter key [2-%s]: " % (len(message) - 1)))

ciphers/xor_cipher.py

@@ -148,7 +148,7 @@ class XORCipher:
                     for line in fin:
                         fout.write(self.encrypt_string(line, key))
 
-        except:
+        except IOError:
             return False
 
         return True
@@ -173,7 +173,7 @@ class XORCipher:
                     for line in fin:
                         fout.write(self.decrypt_string(line, key))
 
-        except:
+        except IOError:
             return False
 
         return True