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Author: ityouknow

README.md

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+# Python 100 天学习计划
+
+从小白到工程师的学习之路
+
+- [100 天 Python 学习计划](http://www.ityouknow.com/python/2019/08/01/python-plan-100-day.html)
+- [第1天：Python 环境搭建](http://www.ityouknow.com/python/2019/08/01/python-001.html)
+- [第2天：Python 基础语法](http://www.ityouknow.com/python/2019/08/02/python-002.html)
+- [第3天：Python 变量与数据类型](http://www.ityouknow.com/python/2019/08/03/python-003.html)
+- [第4天：Python 流程控制](http://www.ityouknow.com/python/2019/08/04/python-004.html)
+- [第4天：Python 流程控制](http://www.ityouknow.com/python/2019/08/04/python-004.html)
+- [第5天：Python 函数](http://www.ityouknow.com/python/2019/08/08/python-005.html)
+- [第6天：Python 模块和包](http://www.ityouknow.com/python/2019/08/13/python-006.html)
+
+关注公众号：python技术，回复"python"一起学习交流
+
+![](http://favorites.ren/assets/images/python.jpg)

day-001/hello.py

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+print("hello world!")

day-002/identifier.py

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+print("hello");
+print("world");

day-002/indent.py

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+if True:
+    print("neo")
+else:
+    print("smile")

day-002/print.py

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+x="a"
+y="b"
+print(x, end=' ')
+print(y, end=' ')

day-003/Dictionary.py

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+Logo_code = {
+ 'BIDU':'Baidu',
+ 'SINA':'Sina',
+ 'YOKU':'Youku'
+ }
+print(Logo_code)
+# 输出{'BIDU': 'Baidu', 'YOKU': 'Youku', 'SINA': 'Sina'}
+print (Logo_code['SINA'])       # 输出键为 'one' 的值
+print (Logo_code.keys())   # 输出所有键
+print (Logo_code.values()) # 输出所有值
+print (len(Logo_code))  # 输出字段长度

day-003/List.py

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+Weekday = ['Monday','Tuesday','Wednesday','Thursday','Friday']
+print(Weekday[0])   # 输出 Monday
+
+#list 搜索
+print(Weekday.index("Wednesday"))
+
+#list 增加元素
+Weekday.append("new")
+print(Weekday)
+
+# list 删除
+Weekday.remove("Thursday")  
+print(Weekday)

day-003/Sets.py

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+a_set = {1,2,3,4}
+# 添加
+a_set.add(5)
+print(a_set)  # 输出{1, 2, 3, 4, 5}
+# 删除
+a_set.discard(5)
+print(a_set)  # 输出{1, 2, 3, 4}

day-003/String.py

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+s = '学习Python'
+# 切片
+s[0], s[-1], s[3:], s[::-1]	# '优', 'n', 'Python', 'nohtyP的雅优'
+# 替换，还可以使用正则表达式替换
+s.replace('Python', 'Java')	# '学习Java'
+# 查找，find()、index()、rfind()、rindex()
+s.find('P')			# 3, 返回第一次出现的子串的下标
+s.find('h', 2)			# 6, 设定下标2开始查找
+s.find('23333')			# -1, 查找不到返回-1
+s.index('y')			# 4, 返回第一次出现的子串的下标
+s.index('P')		# 不同与find(), 查找不到会抛出异常
+# 转大小写, upper()、lower()、swapcase()、capitalize()、istitle()、isupper()、islower()
+s.upper()			# '学习PYTHON'
+s.swapcase()			# '学习pYTHON', 大小写互换
+s.istitle()			# True
+s.islower()			# False
+# 去空格,strip()、lstrip()、rstrip()
+# 格式化
+s1 = '%s %s' % ('Windrivder', 21)	# 'Windrivder 21' 
+s2 = '{}, {}'.format(21, 'Windridver')	# 推荐使用format格式化字符串
+s3 = '{0}, {1}, {0}'.format('Windrivder', 21)
+s4 = '{name}: {age}'.format(age=21, name='Windrivder')
+# 连接与分割，使用 + 连接字符串，每次操作会重新计算、开辟、释放内存，效率很低，所以推荐使用join
+l = ['2017', '03', '29', '22:00']
+s5 = '-'.join(l)			# '2017-03-29-22:00'
+s6 = s5.split('-')			# ['2017', '03', '29', '22:00']
+
+# encode 将字符转换为字节
+str = '学习Python'      
+print (str.encode())			# 默认编码是 UTF-8  输出：b'\xe5\xad\xa6\xe4\xb9\xa0Python'
+print (str.encode('gbk'))      # 输出  b'\xd1\xa7\xcf\xb0Python'
+# decode 将字节转换为字符
+print (str.encode().decode('utf8'))   # 输出 '学习Python'
+print (str.encode('gbk').decode('gbk'))             # 输出 '学习Python'

day-003/Tuple.py

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+letters = ('a','b','c','d','e','f','g')
+print(letters[0])  # 输出 'a'
+print(letters[0:3])  # 输出一组 ('a', 'b', 'c')

day-003/number.py

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+#!/usr/bin/python3
+ 
+counter = 100          # 整型变量
+miles   = 1000.0       # 浮点型变量
+name    = "test"     # 字符串
+ 
+print (counter)
+print (miles)
+print (name)
+
+
+print (5 + 4)  # 加法   输出 9
+print (4.3 - 2) # 减法   输出 2.3
+print (3 * 7)  # 乘法  输出 21
+print (2 / 4)  # 除法，得到一个浮点数    输出 0.5
+print (2 // 4) # 除法，得到一个整数 输出 0
+print (17 % 3) # 取余   输出 2
+print (2 ** 5) # 乘方  输出 32

day-003/variable.py

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+name = "neo"
+print (name)
+
+a, b, c = 1, 2, "neo"
+print (a)
+print (b)
+print (c)

day-004/break.py

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+for letter in 'ityouknow':     # 第一个实例
+   if letter == 'n':        # 字母为 n 时中断
+      break
+   print ('当前字母 :', letter)

day-004/continue.py

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+for letter in 'ityouknow':     # 第一个实例
+   if letter == 'n':        # 字母为 n 时跳过输出
+      continue
+   print ('当前字母 :', letter)

day-004/for.py

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+for letter in 'Python':     # 第一个实例
+   print('当前字母 :', letter)
+
+fruits = ['banana', 'apple',  'mango']
+for fruit in fruits:        # 第二个实例
+   print('当前水果  :', fruit)
+
+print("Good bye!")
+
+
+
+# 通过索引循环
+
+fruits = ['banana', 'apple',  'mango']
+for index in range(len(fruits)):
+   print('当前水果 :', fruits[index])
+
+print("Good bye!")

day-004/if.py

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+#x = int(input("Please enter an integer: "))
+x = -5
+if  x < 0:
+	x = 0
+	print('Negative changed to zero')
+elif x == 0:
+	print('Zero')
+elif x == 1:
+	print('Single')
+else:
+	print('More')

day-004/pass.py

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+while True:
+	pass  # Busy-wait for keyboard interrupt (Ctrl+C)
+
+
+# 这通常用于创建最小结构的类:
+
+class MyEmptyClass:
+	pass

day-004/range.py

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+for i in range(6):
+ print(i)
+print(range(6),'finish')
+
+for i in range(6,10):
+ print(i)
+print(range(6,10),'finish')
+
+for i in range(6,12,2):
+ print(i)
+print(range(6,12,2),'finish')
+
+
+# 迭代链表
+a = ['i', 'love', 'coding', 'and', 'free']
+for i in range(len(a)):
+	print(i, a[i])

day-004/while.py

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+#!/usr/bin/python
+ 
+count = 0
+while (count < 9):
+   print('The count is:', count)
+   count = count + 1
+ 
+print("Good bye!")
+
+
+count = 0
+while count < 6:
+   print(count, " is  less than 6")
+   count = count + 1
+else:
+   print(count, " is not less than 6")

day-005/def.py

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+#定义一个函数
+def hello() :
+   print("Hello World!")
+
+#调用函数
+hello()
+
+
+#定义一个函数
+def helloN(name) :
+   print("Hello World!", name)
+
+#调用函数
+helloN('neo')
+
+#定义函数
+def add(a,b) :
+   return a+b
+
+def reduce(a,b) :
+   return a-b
+
+def multiply(a,b) :
+   return a*b
+
+def divide(a,b) :
+   return a/b
+
+#调用函数
+print(add(1,2))
+print(reduce(12,2))
+print(multiply(6,3))
+print(divide(12,6))
+
+#定义多个返回值函数
+def more(x, y):
+    nx = x + 2
+    ny = y - 2
+    return nx, ny
+
+#调用函数
+x, y = more(10, 10)
+print(x, y)  
+
+
+#递归函数
+def fact(n):
+    if n==1:
+        return 1
+    return n * fact(n - 1)
+
+#调用递归函数
+print(fact(6)) 

day-006/cal/__init__.py

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+def add(a,b) :
+   return a+b
+
+def reduce(a,b) :
+   return a-b
+
+def multiply(a,b) :
+   return a*b
+
+def divide(a,b) :
+   return a/b

day-006/cal/__pycache__/__init__.cpython-37.pyc

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+# 导入模块
+import hello
+ 
+# 现在可以调用模块里包含的函数了
+hello.sayhello()
+
+
+## 直接导入方法
+from hello import sayhello
+sayhello()
+
+
+
+## 导入所有方法
+from hello import *
+sayhello()
+world()
+
+
+print("测试包的使用")
+
+import cal.calculator
+print(cal.calculator.add(1,2))
+
+
+from cal import calculator
+# 使用包的模块的方法
+print(calculator.multiply(3,6))

day-006/cal/__pycache__/calculator.cpython-37.pyc

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+def sayhello():
+   print("Hello World!")
+
+
+def world():
+   print("Python World!")