Python基础语法

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数据类型

基本数据类型：

 

 

 

a = 18
b = str(a)
c = int(b)
d = float(c)
print(type(a), type(b),type(c), type(d))
print(a, b, c, d)

输出结果：

 

String常用的操作：

 

 

a = 'Hello'
b = 'Python'
print(a+b)
print(b*3)
print(a[4])
print(b[2:5])
print('o' in a)
print('g' not in b)

 

 

 list的常用操作：

 

 

 

a = ['c++', 'python', 100, 'java', 99.9]
a.append('go')
print(a)
b = ['in', 'not']
a.extend(b)
print(a)
a.remove('not')
print(a)
del a[1]
print(a)
a.insert(1,'insert')
print(a)
a.clear()

 

 

 list常用函数：

 

修改字典的值：

 

 

a = {'Dh':'1', 'sen':'1', 'ni':1}
print(a)
a['Dh']='d'
print(a)
del a['ni']
print(a)
del a

控制语句

if条件语句

for循环语句

i = 0;
for letter in 'python':
    i = i+1
    print(letter, i)
fruits = ['apple', 'orange', 'banane']
for fruit in fruits:
    print(fruit)
for index in range(len(fruits)):
    print("当前水果：", fruits[index])

while语句

i = 0
while i<10:
    if i%2 == 0:
        print(i,"可以被2整除")
    elif i%3 == 0:
        print(i, "可以被3整除")
    else:
        print(i, "你最牛逼")
    i = i+1

 

 

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