Modernize Python 2 code to get ready for Python 3 AGAIN

Author: cclauss

File_Transfer_Protocol/ftp_client_server.py

@@ -8,21 +8,21 @@
 s.bind((host, port))            # Bind to the port
 s.listen(5)                     # Now wait for client connection.
 
-print 'Server listening....'
+print('Server listening....')
 
 while True:
     conn, addr = s.accept()     # Establish connection with client.
-    print 'Got connection from', addr
+    print('Got connection from', addr)
     data = conn.recv(1024)
     print('Server received', repr(data))
 
-    filename='mytext.txt'
-    f = open(filename,'rb')
-    l = f.read(1024)
-    while (l):
-       conn.send(l)
-       print('Sent ',repr(l))
-       l = f.read(1024)
+    filename = 'mytext.txt'
+    f = open(filename, 'rb')
+    in_data = f.read(1024)
+    while (in_data):
+       conn.send(in_data)
+       print('Sent ', repr(in_data))
+       in_data = f.read(1024)
     f.close()
 
     print('Done sending')
@@ -42,7 +42,7 @@
 s.send("Hello server!")
 
 with open('received_file', 'wb') as f:
-    print 'file opened'
+    print('file opened')
     while True:
         print('receiving data...')
         data = s.recv(1024)
@@ -55,4 +55,4 @@
 f.close()
 print('Successfully get the file')
 s.close()
-print('connection closed')
+print('connection closed')

Project Euler/Problem 29/solution.py

@@ -1,16 +1,18 @@
 def main():
-    """ 
+    """
     Consider all integer combinations of ab for 2 <= a <= 5 and 2 <= b <= 5:
 
     22=4, 23=8, 24=16, 25=32
     32=9, 33=27, 34=81, 35=243
     42=16, 43=64, 44=256, 45=1024
     52=25, 53=125, 54=625, 55=3125
-    If they are then placed in numerical order, with any repeats removed, we get the following sequence of 15 distinct terms:
+    If they are then placed in numerical order, with any repeats removed,
+    we get the following sequence of 15 distinct terms:
 
     4, 8, 9, 16, 25, 27, 32, 64, 81, 125, 243, 256, 625, 1024, 3125
 
-    How many distinct terms are in the sequence generated by ab for 2 <= a <= 100 and 2 <= b <= 100?
+    How many distinct terms are in the sequence generated by ab
+    for 2 <= a <= 100 and 2 <= b <= 100?
     """
 
     collectPowers = set()
@@ -19,15 +21,12 @@ def main():
 
     N = 101     # maximum limit
 
-    for a in range(2,N):
-
-        for b in range (2,N):
-
+    for a in range(2, N):
+        for b in range(2, N):
             currentPow = a**b   # calculates the current power
             collectPowers.add(currentPow)   # adds the result to the set
-            
 
-    print "Number of terms ", len(collectPowers)
+    print("Number of terms ", len(collectPowers))
 
 
 if __name__ == '__main__':

data_structures/Trie/Trie.py

@@ -12,7 +12,7 @@ def __init__(self):
         self.nodes = dict()  # Mapping from char to TrieNode
         self.is_leaf = False
 
-    def insert_many(self, words: [str]):  # noqa: F821 This syntax is Python 3 only
+    def insert_many(self, words: [str]):  # noqa: E999 This syntax is Python 3 only
         """
         Inserts a list of words into the Trie
         :param words: list of string words
@@ -21,7 +21,7 @@ def insert_many(self, words: [str]):  # noqa: F821 This syntax is Python 3 only
         for word in words:
             self.insert(word)
 
-    def insert(self, word: str):  # noqa: F821 This syntax is Python 3 only
+    def insert(self, word: str):  # noqa: E999 This syntax is Python 3 only
         """
         Inserts a word into the Trie
         :param word: word to be inserted
@@ -34,7 +34,7 @@ def insert(self, word: str):  # noqa: F821 This syntax is Python 3 only
             curr = curr.nodes[char]
         curr.is_leaf = True
 
-    def find(self, word: str) -> bool:  # noqa: F821 This syntax is Python 3 only
+    def find(self, word: str) -> bool:  # noqa: E999 This syntax is Python 3 only
         """
         Tries to find word in a Trie
         :param word: word to look for
@@ -48,7 +48,7 @@ def find(self, word: str) -> bool:  # noqa: F821 This syntax is Python 3 only
         return curr.is_leaf
 
 
-def print_words(node: TrieNode, word: str):  # noqa: F821 This syntax is Python 3 only
+def print_words(node: TrieNode, word: str):  # noqa: E999 This syntax is Python 3 only
     """
     Prints all the words in a Trie
     :param node: root node of Trie

dynamic_programming/abbreviation.py

@@ -10,6 +10,8 @@
 a=daBcd and b="ABC"
 daBcd -> capitalize a and c(dABCd) -> remove d (ABC)
 """
+
+
 def abbr(a, b):
     n = len(a)
     m = len(b)
@@ -26,4 +28,4 @@ def abbr(a, b):
 
 
 if __name__ == "__main__":
-    print abbr("daBcd", "ABC") # expect True
+    print(abbr("daBcd", "ABC"))  # expect True

dynamic_programming/fastfibonacci.py

@@ -7,14 +7,14 @@
 
 
 # returns F(n)
-def fibonacci(n: int):  # noqa: F821 This syntax is Python 3 only
+def fibonacci(n: int):  # noqa: E999 This syntax is Python 3 only
     if n < 0:
         raise ValueError("Negative arguments are not supported")
     return _fib(n)[0]
 
 
 # returns (F(n), F(n-1))
-def _fib(n: int):  # noqa: F821 This syntax is Python 3 only
+def _fib(n: int):  # noqa: E999 This syntax is Python 3 only
     if n == 0:
         # (F(0), F(1))
         return (0, 1)

machine_learning/scoring_functions.py

@@ -70,9 +70,9 @@ def mbd(predict, actual):
     difference = predict - actual
     numerator = np.sum(difference) / len(predict) 
     denumerator =  np.sum(actual) / len(predict)
-    print str(numerator)
-    print str(denumerator)
+    print(numerator)
+    print(denumerator)
 
     score = float(numerator) / denumerator * 100
 
-    return score
+    return score