书爱上python

源码是在网上找的网页

print('a={}'.format(2))

print('-------')

#list
print('------')

a=[1,2,3,4]
print(a[-1])

# first index is 0
a.insert(4,5)
print(a)

a.append(6)
print(a)
b = a.pop()
print(a, b)

# 删除第二个元素
a.pop(1)
print(a)

# tuple
print('---------')

a = (1,2,3)
print(a)
print(len(a))
print(type(a))

# 不可变，不支持赋值
# a[0] = 2
print(a)

# dict
print('--------')


a = {
    'b': 1,
    'c': 2,
    'd': 3,
}


print(a['b'])

print('f' in a)

print(a.get('f'))
print(a.pop('d'))
print(a)

# set
print('----------')

a = set([1,2,3,3])
print(a)

a.add(5)

print(a)

a.remove(3)
print(a)

print('''
a
bc
d
''')

# if else
for i in range(4):
    print(i)
    if(i==3):
        # 退出循环
        break

# break
for i in range(6):
    if(i==2):
        break
    print(i)

# continue
for j in range(5):
    if(j==3):
        continue
    # 不会打印3
    print(j)

# try
try:
    a = 1/0
except:
    print('error')

# module.py

import random

from  random import randrange
from check import check_even

print(random.randrange(1,10))


print(randrange(2,4))

print(check_even(2))

# check.py

def check_even(num):
    if(num %2 ==0):
        return True
    return False