python-day03_02 Number 自动类型转换 (int float complex bool)

# ### Number 自动类型转换 (int float complex bool)
"""
低精度默认向高精度进行转换
bool -> int -> float -> complex
"""
# bool + int
res = True + 100
print(res ,type(res)) # 1 + 100 => 101

# bool + float
res = True  + 344.565 # 1.0 + 344.565 => 345.565
print(res ,type(res)) 

# bool + complex
res = True + 7 - 90j  #  1 + 0j + 7 - 90j => 8 - 90j
print(res ,type(res)) 

# int + float
res = 5 + 7.88 # 5.0 + 7.88 => 12.88 
print(res ,type(res)) #12.879999999999999 <class 'float'> 出现这种情况是一种精度上的损耗

# int + complex
res = 5 + 6 + 8j # 5 + 0j   6 + 8j => 11 + 8j
print(res ,type(res)) 

# float + complex 
res = 5.66 + 9.1 -90j # 5.66 + 0j + 9.1 -90j => 14.76-90j
print(res ,type(res)) 

'''
# 小数的精度损耗 (小数后面一般有时截取15~18位,但是不完全,存在精度损耗)
"""不要用小数作比较,较不准"""
print(0.1 + 0.2 == 0.3)
print(5.1 + 5.9 == 11.0)
0.0999999999999999
'''