learn python

.gitignore

@@ -1 +1,2 @@
-/DataStructure/.idea
+/DataStructure
+/.idea

Python/Data Types/1-python-lists.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+t = int(raw_input())
+
+nums = []
+
+for i in range(0, t):
+    orgs = raw_input().split(' ')
+    if orgs[0] == "insert":
+        nums.insert(int(orgs[1]), int(orgs[2]))
+    elif orgs[0] == "append":
+        nums.append(int(orgs[1]))
+    elif orgs[0] == "remove":
+        nums.remove(int(orgs[1]))
+    elif orgs[0] == "pop":
+        nums.pop()
+    elif orgs[0] == "index":
+        print nums.index(int(orgs[1]))
+    elif orgs[0] == "count":
+        print nums.count(int(orgs[1]))
+    elif orgs[0] == "sort":
+        nums.sort()
+    elif orgs[0] == "reverse":
+        nums.reverse()
+    elif orgs[0] == "print":
+        print nums

Python/Data Types/2-python-tuples.py

@@ -0,0 +1,10 @@
+#!/usr/bin/python
+
+from __builtin__ import hash
+
+n = int(raw_input())
+nums = map(int, raw_input().split(" "))
+
+tuples = tuple(nums)
+
+print hash(tuples)

Python/Data Types/3-sets.py

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+#!/usr/bin/python
+
+m = int(raw_input())
+one = set(map(int, raw_input().split()))
+n = int(raw_input())
+two = set(map(int, raw_input().split()))
+
+result = one.symmetric_difference(two)
+
+for i in sorted(result):
+    print i

Python/Data Types/4-list-comprehensions.py

@@ -0,0 +1,5 @@
+#!/usr/bin/python
+
+x, y, z, n = (int(input()) for i in range(4))
+
+print [[a, b, c] for a in range(0, x + 1) for b in range(0, y + 1) for c in range(0, z + 1) if a + b + c != n]

Python/Data Types/5-find-second-maximum-number-in-a-list.py

@@ -0,0 +1,16 @@
+#!/usr/bin/python
+
+n = int(raw_input())
+
+nums = map(int, raw_input().split())
+
+print max(filter(lambda x: x != max(nums), nums))
+
+# just solution two.
+# big, sbig = -6000, -6000
+# for i in lis:
+#     if (i > big):
+#         big, sbig = i, big
+#     elif (i < big and i > sbig):
+#         sbig = i
+# print (sbig)

Python/Data Types/6-nested-list.py

@@ -0,0 +1,32 @@
+#!/usr/bin/python
+
+a = [[raw_input(), float(raw_input())] for _ in range(int(raw_input()))]
+s = sorted(set(x[1] for x in a))
+
+for name in sorted(x[0] for x in a if x[1] == s[1]):
+    print name
+
+# stupied
+# n = int(raw_input())
+
+# stus = []
+
+# for _ in range(n):
+#     name = raw_input()
+#     grade = float(raw_input())
+#     stus.append([name, grade])
+
+# stus.sort(lambda x, y: cmp(x[1], y[1]))
+# print stus
+# min = stus[0][1]
+# stus = filter(lambda x: x[1] != min, stus)
+# print stus
+# min = stus[0][1]
+
+# results = filter(lambda x: x[1] == min, stus)
+# print stus
+# results.sort(lambda x, y: cmp(x[0], y[0]))
+# print stus
+
+# for s in results:
+#     print s[0]

Python/Introduction/1-py-hello-world.py

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+#!/usr/bin/python
+
+print("Hello World!")

Python/Introduction/10-whats-your-name.py

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+#!/usr/bin/python
+
+firstname = raw_input()
+lastname = raw_input()
+
+print "Hello %s %s! You just delved into python." % (firstname, lastname)

Python/Introduction/11-interchange-two-numbers.py

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+#!/usr/bin/python
+
+a = int(raw_input())
+b = int(raw_input())
+
+temp = a
+a = b
+b = temp
+
+num = (a, b)
+
+print num[0]
+print num[1]

Python/Introduction/12-finding-the-percentage.py

@@ -0,0 +1,15 @@
+#!/usr/bin/python
+
+t = int(raw_input())
+
+stus = {}
+
+for i in range(0, t):
+    name, math, physic, chemistry = raw_input().split(" ")
+    stus[name] = (float(math) + float(physic) + float(chemistry)) / 3
+
+name = raw_input()
+if name in stus:
+    print("%.2f" % stus[name])
+else:
+    print "No"

Python/Introduction/13-python-print.py

@@ -0,0 +1,11 @@
+#!/usr/bin/python
+
+# n = int(raw_input())
+
+# print ''.join(map(str, range(1, n + 1)))
+# print ''.join(str(x+1) for x in range(input()))
+
+from __future__ import print_function
+
+N = int(input())
+print(*range(1, N + 1), sep='', end='\n', file=sys.stdout)

Python/Introduction/2-python-raw-input.py

@@ -0,0 +1,5 @@
+#!/usr/bin/python
+
+input = raw_input()
+
+print(input)

Python/Introduction/3-python-arithmetic-operators.py

@@ -0,0 +1,8 @@
+#!/usr/bin/python
+
+one = int(raw_input())
+two = int(raw_input())
+
+print(one + two)
+print(one - two)
+print(one * two)

Python/Introduction/4-python-division.py

@@ -0,0 +1,9 @@
+#!/usr/bin/python
+
+from __future__ import division
+
+one = int(raw_input())
+two = int(raw_input())
+
+print(one // two)
+print(one / two)

Python/Introduction/5-python-mod-divmod.py

@@ -0,0 +1,11 @@
+#!/usr/bin/python
+
+from __future__ import division
+
+# a = int(raw_input())
+# b = int(raw_input())
+a, b = int(raw_input(), raw_input())
+
+print(a // b)
+print(a % b)
+print(divmod(a, b))

Python/Introduction/6-python-power-mod-power.py

@@ -0,0 +1,8 @@
+#!/usr/bin/python
+
+a = int(raw_input())
+b = int(raw_input())
+m = int(raw_input())
+
+print(a ** b)
+print(pow(a, b, m))

Python/Introduction/7-python-integers-come-in-all-sizes.py

@@ -0,0 +1,8 @@
+#!/usr/bin/python
+
+a = int(raw_input())
+b = int(raw_input())
+m = int(raw_input())
+
+print(a ** b)
+print(pow(a, b, m))

Python/Introduction/8-python-integers-come-in-all-sizes.py

@@ -0,0 +1,8 @@
+#!/usr/bin/python
+
+a = int(raw_input())
+b = int(raw_input())
+c = int(raw_input())
+d = int(raw_input())
+
+print(a**b + c**d)

Python/Introduction/9-python-loops.py

@@ -0,0 +1,6 @@
+#!/usr/bin/python
+
+a = int(raw_input())
+
+for i in range(0, a):
+    print i ** 2

Python/String/1-swap-case.py

@@ -0,0 +1,18 @@
+#!/usr/bin/python
+
+from __future__ import print_function
+
+s = raw_input()
+
+for a in s:
+    if a.isalpha():
+        if a.islower():
+            print(a.upper(), end="")
+        else:
+            print(a.lower(), end="")
+    else:
+        print(a, end="")
+
+# wtf!!!!
+# import string
+# print string.swapcase(raw_input())

Python/String/10-python-string-formatting.py

@@ -0,0 +1,12 @@
+#!/usr/bin/python
+
+n = int(raw_input())
+
+width = len(bin(n)) - 2
+
+for i in range(1, n + 1):
+    print "{0:{width}d} {0:{width}o} {0:{width}X} {0:{width}b}".format(i,width = width)
+
+# from __future__ import print_function
+# for i in range(1, n + 1):
+#     print("%s %s %s %s" % (str(i).rjust(width, " "), str(oct(i))[1:].rjust(width, " "), hex(i)[2:].rjust(width, " ").upper(), bin(i)[2:].rjust(width, " ")))

Python/String/11-alphabet-rangoli.py

@@ -0,0 +1,36 @@
+#!/usr/bin/python
+
+# n = int(raw_input())
+# for i in range(n):
+#     s = "-".join(chr(ord('a')+n-j-1) for j in range(i+1))
+#     print((s+s[::-1][1:]).center(n*4-3, '-'))
+
+# for i in range(n-1):
+#     s = "-".join(chr(ord('a')+n-j-1) for j in range(n-i-1))
+#     print((s+s[::-1][1:]).center(n*4-3, '-'))
+
+a = ord('a')
+n = int(raw_input())
+width = 4 * n - 3
+
+str = []
+
+for i in range(1, n):
+    left = ''
+    for j in range(i - 1):
+        left = left + chr(a + n - 1 - j) + '-'
+        right = left;
+    left = left + chr(a + n - i) + left[::-1]
+    str.append(left)
+
+center = ''
+for i in range(n - 1):
+    center = center + chr(a + n - 1 - i) + '-'
+center = center + 'a' + center[::-1]
+
+for s in str:
+    print s.center(width, '-')
+print center.center(width, '-')
+
+for s in reversed(str):
+    print s.center(width, '-')

Python/String/12-capitalize.py

@@ -0,0 +1,3 @@
+#!/usr/bin/python
+
+print ' '.join(word.capitalize() for word in raw_input().split(' '))

Python/String/13-the-minion-game.py

@@ -0,0 +1 @@
+#!/usr/bin/python

Python/String/2-python-string-split-and-join.py

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+#!/usr/bin/python
+
+print "-".join(raw_input().split())

Python/String/3-python-mutations.py

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+#!/usr/local/python
+
+s = raw_input()
+args = raw_input().split()
+pos = int(args[0])
+char = args[1]
+
+print s[:pos] + char + s[pos + 1:]

Python/String/4-find-a-string.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+string = raw_input()
+findme = raw_input()
+count = 0
+start = 0
+
+while 1:
+    temp = string.find(findme, start)
+    if (temp != -1):
+        count = count + 1
+        start = temp + 1
+    else:
+        break
+
+print count
+
+# A = raw_input()
+# x = raw_input()
+
+# count = 0
+# for i in range(len(A)-len(x)):
+
+#     if A[i:i+len(x)] == x:
+#         count += 1
+# print count