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Python学习笔记

1. 循环次数限制

lucky_num = 19
guess_count = 0

while guess_count<3:
    print("guess count:",guess_count)
    input_num = int(input("Input the guess num:"))
    if input_num>lucky_num:
        print("the real number is smaller.")
    elif input_num<lucky_num:
        print("the real num is bigger...")
    else:
        print("Bingo!")
        break

    guess_count += 1
else:
    print("Too many retrys!")

2. for循环

lucky_num = 19

for i in range(3):
    input_num = int(input("Input the guess num:"))
    if input_num>lucky_num:
        print("the real number is smaller.")
    elif input_num<lucky_num:
        print("the real num is bigger...")
    else:
        print("Bingo!")
        break

else:
    print("Too many retrys!")

3. %号表示【】

name = input("name:")
age = input("age:")
job = input("job:")

print("Information of %s:\nName:%s\nAge:%s\nJob:%s" %(name,name,age,job))

不建议使用+，占空间

三个单引号注释

在使用pycharm时，经常会需要多行代码同时缩进、左移，pycharm提供了快捷方式

1、pycharm使多行代码同时缩进

   鼠标选中多行代码后，按下Tab键，一次缩进四个字符

2、pycharm使多行代码同时左移

  鼠标选中多行代码后，同时按住shift+Tab键，一次左移四个字符

实例：

name = input("name:")
age = input("age:")
job = input("job:")

msg = '''
Information of %s:
    Name:%s
    Age:%s
    Job:%s
''' %(name,name,age,job)
print(msg)

Strip()脱

Append追加''clear'清除空间, 'copy'复制, ' count() 方法用于统计字符串里某个字符出现的次数。可选参数为在字符串搜索的开始与结束位置。

', 'extend 函数用于在列表末尾一次性追加另一个序列中的多个值（用新列表扩展原来的列表）。

', 'index'索引, 'insert 函数用于将指定对象插入列表的指定位置。

', 'pop' 函数用于移除列表中的一个元素（默认最后一个元素），并且返回该元素的值。

, 'remove' 函数用于移除列表中某个值的第一个匹配项。

, 'reverse函数用于反向列表中元素。

', 'sort函数用于对原列表进行排序，如果指定参数，则使用比较函数指定的比较函数。

'实例：

name_list = ["alex","65brother","tenglan"]
name_list.append("ERIC")
name_list.insert(2,"66brother")
name1 = name_list[3]
print(name1)
print(dir(name_list))
print(name_list.index("65brother"))
print(name_list.count("65brother"))
print(name_list[2])
print(name_list.pop())
print(name_list.reverse())
name_list.append("*")

 

实例2：

name_list = [1,2,3,4,"Alex","John"]
a = name_list
name_list2 = ["Kevin","Mike"]
b = name_list2
a.extend(b)
name = "Nebula"
a.extend(name)
print(a)

4. 元组

5. 运算符

+，%余数，**返回x的y次幂，//返回商的整数部分

&,与；|，或；^,异或，一真一假即为真；<<左移除2；>>右移×2

实例：

a = [1,2,3,4,5,6]
b = (1,2,3,4)
print(type(a))
print(type(b))

6. 嵌套循环

for j in range(5):
    for i in range(10):
        if i<5:
           continue

        if j>3:
           break
        print(i)

7. 文件读写

'''f = open("test.log","w")

f.write("This is the first line\n")
f.write("This is the second line\n")
f.write("This is the third line\n")
f.write("This is the fourth line\n")
'''
f = open("test.log","r")
print(f.read())
f.close()

f = open("test.log","r")
for line in f:
    print(line)
f.close()

Tips:Write直接覆盖原来文件

写读实例：

f = open("test.log","w+")

f.write("new line\n")
print(f.readline())
print("data:",)
f.close()

8. 字典

9. 不同种类的Python

(1)Cpython,C解释器，.pyc（字节码） 机器码 CPU

(2)jpython,java解释器，java字节码 机器码 CPU

(3)ironpython. C#

 sys.argv:是一种列表类型，用于获取命令行参数的列表。

标签：入门,pt,python,笔记,mso,print,font,margin,name
来源： https://www.cnblogs.com/resort-033/p/12198269.html