"""
01：range()函数调查
02：通过help()函数调查range()函数功能
03：Python中的转义字符
04：使用start、step、stop的方式尝试初始化list、tuple、set等
05：使用len()获取list、set、tuple的长度
"""
help(range)
tempRange = range(1,100,2)
print("type(tempRange): " + str(type(tempRange)))
print("tempRange: " + str(tempRange))
tempStr = ""
for i in range(5): # 注意 输出0到4，包括0和4但不包括5.
tempStr += (" " + str(i) + " ")
print("for i in range(5) " + tempStr) #for i in range(5) 0 1 2 3 4
tempStr = ""
for i in range(20,0,-2):
tempStr += (" " + str(i) + " ")
# 注意看输出不包括0
print("for i in range(20,0,-2) " + tempStr)
"""
for i in range(20,0,-2) 20 18 16 14 12 10 8 6 4 2
"""
tempStr = ""
for i in [1,2,3]:
tempStr += (" " + str(i) + " ")
# for i in [1,2,3] 1 2 3
print("for i in [1,2,3] " + tempStr)
tempStr = ""
for i in "Hello world!":
tempStr += (" " + str(i) + " ")
# for i in "Hello world!" H e l l o w o r l d !
print("for i in \"Hello world!\" " + tempStr)
print(list(range(5,10))) # 默认步长1，输出：[5, 6, 7, 8, 9]不包括10
print(list(range(0,10,2))) #输出：[0, 2, 4, 6, 8]
print(list(range(10,0,2))) #输出：[]
print(list(range(10,0,-2))) #输出：[10, 8, 6, 4, 2]
# 尝试使用start、step、stop的方式尝试初始化list、tuple、set等
# print(list(1,9,1)) # TypeError: list() takes at most 1 argument (3 given)
# print(set(1,9,1)) # TypeError: set expected at most 1 arguments, got 3
# print(tuple(1,9,1)) # TypeError: tuple() takes at most 1 argument (3 given)
tempList = list(range(0,10,1));
print("list(range(0,10,1)): " + str(tempList))
tempSet = set(range(0,10,1))
print("list(set(0,10,1)): " + str(tempSet))
tempTuple = tuple(range(0,10,1))
print("list(tuple(0,10,1)): " + str(tempTuple))
tempDic = {"num":1}
print("len(list) :" + str(len(tempList))) # len(list) :10
print("len(set) :" + str(len(tempSet))) # len(set) :10
print("len(tuple) :" + str(len(tempTuple))) # len(tuple) :10
print("len(dic) :" + str(len(tempDic))) # len(dic) :1
# list.append [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'b']
tempList.append('b')
print("list.append " + str(tempList))
# set.add {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'a'}
tempSet.add('a')
print("set.add " + str(tempSet))