Python3.5开发4 - 基本的控制与读写Csv文件

浅浅的花香味﹌ 2022-05-10 14:46 134阅读 0赞

### Python3.5开发4 - 基本的控制与读写Csv文件 ###

Windows乱码解决：excel中，点击 数据->自文本 打开 （UTF-8；分隔符是逗号）

知识点：

*  控制语句
 *  读取CSV文件

演示：

# var
    # a = 1
    # del a
    # print a
    
    # list
    a = [1,2,3,'w',4,5]
    print(3 in a)
    print(100 in a)
    
    # dic
    c = { 'x':'hello','y':'world'}
    print('y' in c) # 只可以判断key,不可以判断value
    print('hello' in c)
    
    a = { 'x':1}
    a['y'] = 2
    print(a)
    
    a = { 'x': 1, 'y':2}
    a.pop('x')
    print(a)
    
    # ==========================
    # if
    a = '1'
    b = 1
    print(a==b)
    
    print(1<2<3)
    
    a = [1,2,3,4]
    if 3 in a:
        print('right')
    
    a = [1,2]
    if not a:
        print('a is empty')
    else:
        print('a is not empty')
    
    b = { }
    if not b:
        print('b is empty')
    
    a = [1,2]
    if not a:
        print('a is empty')
    elif len(a) == 1:
        print('a有一个元素')
    else:
        print('a有很多元素')
    
    # for
    for i in range(10):
        print(i)
    
    a = [1,2,'x',['x','y'],5]
    for each in a:
        print(each)
    
    a = { 'x':'I am x','y':'I am y','z':'I am z'}
    for k in a:
        print(k)
        print(a[k])
    
    b = a.items()
    print(b)
    print(list(b))
    print(list(b)[0])
    print(list(b)[0][1])
    
    c = [('x', 'I am x'), ('y', 'I am y'), ('z', 'I am z')]
    d = dict(c)
    print(d)
    print(d['z'])
    
    # import time
    # i = 0
    # while i < 10:
    # print(i)
    # # i = i + 1
    # time.sleep(0.5)
    
    i = 0
    while True:
        print(i)
        i =  i + 1
        if i > 10:
            break
    
    for i in range(100):
        if i == 50:
            print(i)
        else:
            continue
    
    for i in range(10):
        for j in range(i):
            for k in range(j):
                print(i,j,k)
    
    # read and write csv
    import csv
    
    # f = open('class4.csv','r',encoding='UTF-8')
    # reader = csv.DictReader(f)
    # for e in reader:
    # print(e['身高'])
    # print(e['体重'])
    # f.close()
    
    a = [{ '身高':177,'体重':107},{ '身高':127,'体重':105},{ '身高':177, '体重':100},{ '身高':107, '体重':90},{ '身高':130, '体重':70}]
    f = open('class4.csv','w',encoding='UTF-8')
    writer = csv.DictWriter(f,fieldnames=['身高', '体重'])
    writer.writeheader()
    writer.writerows(a)
    # for e in a:
    # writer.writerow(e)
    f.close()
    
    # ===========================================
    # a = 'hello yu xiang'
    #
    # for e in a:
    # print(e)
    
    # 排序
    # a = [3,4,1,7,2,5]
    # a.sort()
    # # a.sort(reverse=True)
    # print(a)
    #
    # a = input('请出入数据：')
    # print(type(a))
    # print('a的值是：{}'.format(a))

作业：猜数游戏

代码：

import random
    import csv
    import time
    import os
    
    
    info = { }
    count = 0
    
    name = input('请输入你的姓名：')
    time = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
    info = { '时间': time, '姓名': name}
    
    num = random.randint(0,10)
    value = int(input('请输入一个数字：'))
    while True:
        if value > num:
            count += 1
            print('偏大')
            value = int(input('请重新输入这个数：'))
        elif value < num:
            count += 1
            print('偏小')
            value = int(input('请重新输入这个数：'))
        else:
            count += 1
            print('正确')
            break
    
    info['步数'] = count
    
    if os.path.exists('guess_num.csv'):
        title = True
    else:
        title = False
    
    f = open('guess_num.csv','a',encoding='UTF-8')
    writer = csv.DictWriter(f,fieldnames=['时间','姓名','步数'])
    if not title:
        writer.writeheader()
    writer.writerow(info)
    f.close()