python if x:

# !usr/bin/env python
# -*- coding:utf-8 _*-
"""
@author:happy_code
@email: happy_code@foxmail.com
@file:  ifTest.py
@time:  2018/12/03
"""

a = ''
b = None
c = ' '
d = False
e = {}
f = []
g = ()
h = True
i = 1
j = object

if a:
    print('空串')
if b:
    print('None')
if c:
    print('空格字符串')
if d:
    print('False')
if e:
    print('空dict')
if f:
    print('空list')
if g:
    print('空tuple')
if h:
    print('True')
if i:
    print('1')
if j:
    print('class')

结果

空格字符串
True
1
class