python如何寻找主串中所有指定子串下标

def subStrIndex(substr,str):
    result = []
    index = 0
    while str.find(substr,index,len(str)) != -1:
        temIndex = str.find(substr,index,len(str))
        result.append(temIndex)
        index = temIndex + 1
    return result

str = "我们去了天安门，天安门附近有很多人"
list = subStrIndex('天安门',str)
print(list)

mystr = "hello world and itcast and itheima and Python"
print(mystr.find('and')) # 12
print(mystr.find('and', 15, 30)) # 23
print(mystr.find('ands')) # -1

mystr = "hello world and itcast and itheima and Python"
print(mystr.index('and')) # 12
print(mystr.index('and', 15, 30)) # 23
print(mystr.index('ands')) # 报错

mystr = "hello world and itcast and itheima and Python"
print(mystr.count('and')) # 3
print(mystr.count('ands')) # 0
print(mystr.count('and', 0, 20)) # 1

mystr = "hello world and itcast and itheima and Python"
# 结果：hello world he itcast he itheima he Python
print(mystr.replace('and', 'he'))
# 结果：hello world he itcast he itheima he Python
print(mystr.replace('and', 'he', 10))
# 结果：hello world and itcast and itheima and Python
print(mystr)

mystr = "hello world and itcast and itheima and Python"
# 结果：['hello world ', ' itcast ', ' itheima ', ' Python']
print(mystr.split('and'))
# 结果：['hello world ', ' itcast ', ' itheima and Python']
print(mystr.split('and', 2))

list1 = ['chuan', 'zhi', 'bo', 'ke']

# 结果：chuan_zhi_bo_ke
print('_'.join(list1))

mystr = "hello world and itcast and itheima and Python"

# 结果：Hello world and itcast and itheima and python
print(mystr.capitalize())

# 结果：Hello World And Itcast And Itheima And Python
print(mystr.title())

# 结果：hello world and itcast and itheima and python
print(mystr.lower())

# 结果：HELLO WORLD AND ITCAST AND ITHEIMA AND PYTHON
print(mystr.upper())

mystr = "hello world and itcast and itheima and Python "
# 结果：True
print(mystr.startswith('hello'))
# 结果False
print(mystr.startswith('hello', 5, 20))

mystr = "hello world and itcast and itheima and Python"
# 结果：True
print(mystr.endswith('Python'))
# 结果：False
print(mystr.endswith('python'))
# 结果：False
print(mystr.endswith('Python', 2, 20))

mystr1 = 'hello'
mystr2 = 'hello12345'
# 结果：True
print(mystr1.isalpha())
# 结果：False
print(mystr2.isalpha())
-----------------------------
mystr1 = 'aaa12345'
mystr2 = '12345'
# 结果： False
print(mystr1.isdigit())
# 结果：False
print(mystr2.isdigit())
-----------------------------
mystr1 = 'aaa12345'
mystr2 = '12345-'
# 结果：True
print(mystr1.isalnum())
# 结果：False
print(mystr2.isalnum())
-----------------------------
mystr1 = '1 2 3 4 5'
mystr2 = ' '
# 结果：False
print(mystr1.isspace())
# 结果：True
print(mystr2.isspace())