first commit

Author: Honlan

.DS_Store

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-# Python-Basic
+## Python-Basic
+
+Python基础入门课程，使用Python3.6自带的IDLE编程
+
+介绍Python基础语法，包括变量、类型、条件、循环、列表、字符串、字典、函数等内容
+
+## 文件说明
+
+- `ppt`：课程课件，共14个pdf；
+- `codes`：课程代码，文件名带exercise表示课堂练习，不带表示课后习题；
+- `python-3.6.2-amd64.exe`：Windows下Python3.6安装文件；
+- `python-3.6.2-macosx10.6.pkg`：Mac下Python3.6安装文件。

README.md

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+alphabet = 'abcdefghijklmnopqrstuvwxyz'
+
+key = int(input('> Please input the Key: '))
+msg = input('> Please input a message: ')
+msg = msg.lower()
+
+new_msg = ''
+for c in msg:
+    pos = alphabet.find(c)
+    if pos == -1:
+        new_msg += c
+    else:
+        pos = (pos + key) % len(alphabet)
+        new_msg += alphabet[pos]
+
+print('The encrypted message is: ', new_msg)
+
+old_msg = ''
+for c in new_msg:
+    pos = alphabet.find(c)
+    if pos == -1:
+        old_msg += c
+    else:
+        pos = (pos - key) % len(alphabet)
+        old_msg += alphabet[pos]
+
+print('The encrypted message is: ', old_msg)
+

codes/.DS_Store

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+msg = "Kyv wLIKyvJK uzJKrEtv zE Kyv NFICu, zJ EFK svKNvvE Czwv rEu uvrKy. sLK NyvE z JKrEu zE wIFEK Fw PFL, PvK PFL uFE'K BEFN KyrK z CFMv PFL"
+alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
+
+for key in range(len(alphabet)):
+    old_msg = ''
+    for c in msg:
+        pos = alphabet.find(c)
+        if pos == -1:
+            old_msg += c
+        else:
+            pos = (pos - key) % len(alphabet)
+            old_msg += alphabet[pos]
+    print('The Key: ', key)
+    print('The decrypted message is: ', old_msg)

codes/10_1_decrypt_message.py

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+s1 = '今天天气非常非常的好'
+s2 = '非常的'
+
+while True:
+    pos = s1.find(s2)
+    if pos == -1:
+       break 
+    
+    s_before = s1[:pos]
+    s_after = s1[pos + len(s2):]
+    s1 = s_before + s_after
+    print(s1)

codes/10_2_decrypt_without_key.py

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+import random
+
+alphabet = 'a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z'
+
+base = alphabet.split(',')
+target = base.copy()
+random.shuffle(target)
+
+cipher = {}
+d_cipher = {}
+for i in range(len(base)):
+    cipher[base[i]] = target[i]
+    d_cipher[target[i]] = base[i]
+# d_cipher = {v: k for k, v in cipher.items()}
+
+msg = input('Please input a message: ')
+new_msg = ''
+for c in msg:
+    new_msg = new_msg + cipher.get(c, c)
+print('The secret message is: ', new_msg)
+
+plain_msg = ''
+for c in new_msg:
+    plain_msg = plain_msg + d_cipher.get(c, c)
+
+print('The plain message is: ', plain_msg)
+
+
+
+    

codes/10_find_and_remove.py

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+numbers = input('Please input a lots of numbers: ')
+count1 = {}
+count2 = {}
+count2['oushu'] = 0
+count2['jishu'] = 0
+
+for c in numbers:
+    if c in count1:
+        count1[c] += 1
+    else:
+        count1[c] = 1
+
+    if int(c) % 2 == 0:
+        count2['oushu'] += 1
+    else:
+        count2['jishu'] += 1
+
+print(count1)
+print(count2)
+

codes/11_decrypt_message_with_dict.py

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+def rect_cal(width, height):
+    area = width * height
+    zhouchang = (width + height) * 2
+    return area, zhouchang
+
+width = float(input('Please input the width: '))
+height = float(input('Please input the height: '))
+
+print(rect_cal(width, height))

codes/11_exercise_count_numbers.py

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+def find_and_remove(s1, s2, flag):
+    pos = s1.find(s2)
+    if pos == -1:
+        return s1
+
+    if flag:
+        # 全部删除
+        while True:
+            pos = s1.find(s2)
+            if pos == -1:
+                break
+            s1 = s1[:pos] + s1[pos + len(s2):]
+        return s1
+    else:
+        # 只删一次
+        return s1[:pos] + s1[pos + len(s2):]
+
+print(find_and_remove('你好啊你好啊', '我不好', True))
+print(find_and_remove('今天天气非常非常非常的好', '非常', False))
+print(find_and_remove('今天天气非常非常非常的好', '非常', True))
+print('=' * 10)
+print('今天天气非常非常非常的好'.replace('非常', ''))
+print('今天天气非常非常非常的好'.replace('非常', '', 1))
+
+
+
+
+
+
+