python基础学习1，,Python基础学习

Python基础学习1

字符串表达形式共四种：

name = "string"name = ‘string‘name = """string"""name = ‘‘‘string‘‘‘

数字基本运算方式：

a = 39b = 4c = a + bc = a - bc = a*bc= a**b #次幂c = a/bc = a%b #取余数c = a//b #取除数

条件判断：

in1 = input(‘please input the rank:‘)print(in1)if in1 == ‘1‘:    print(‘hello world!‘)elif in1 == ‘2‘:    print(‘HELLO WORLD!‘)elif in1 == ‘3‘:    print(‘hello world 3‘)else:    print(‘hello world 4‘)

上面代码中，通过input输入的数字并没有被python视为数字，而是视为了字符串，故下面在条件判断时需要使用引号将数字引起。

循环判断：

while count < 10:    print(count)    count = count + 1

使用循环完成简单的算法：

# output numbers: 1 to 10 without 7n = 1while n < 11:    if n != 7:        print(n)    n = n + 1print(‘---end---‘)# find sum of numbers from 1 to 100n = 1sumofn = 0while n < 101:    sumofn = sumofn + n    n = n + 1print(sumofn)# find sum of numbers 1-2+3-4+...-100n = 1sumofnn = 0while n < 101:    if n%2 == 0:        sumofnn = sumofnn - n    else:        sumofnn = sumofnn + n    n = n + 1print(sumofnn)

python基础学习1