1.强转为int

string->int

a = 'string'
print(int(a))

a = '1.2'
print(int(a))

a = '12'
print(int(a))

string仅在无特殊字符（包括小数点）且全为数字的情况下可强转为float

boolen->int

a = True
b = False
print(int(a))
print(int(b))

float->int

a = 1.1
print(int(a))

2.强转为string

int->string

a = 1
print(str(a))

float->string

a = 1.0
print(str(a))

boolean->string

a = True
print(str(a))

3.强转为boolean

string->boolean

a = 'string'
print(bool(a))

int->boolean

a = 1
print(bool(a))

float->boolean

a = 1.1
print(bool(a))

4.强转为float

int->float

a = 1
print(float(a))

string->float

a = 'string'
print(float(a))

b = 'ab12'
print(float(b))

c = '1-1'
print(float(c))

d = '12.0'
print(float(d))

string仅在无特殊字符（包括小数点）且全为数字的情况下可强转为float

boolean->float

a = True
print(float(a))