Python3.5開發3 - 基本命令及如何進行讀寫檔案

知識點：

• 熟練使用Python的列表，元組，集合與字典
• 熟練使用Python讀寫檔案

演示：

# list

a = [1,'yx',['x','y'],6]



print(a)

print(a[2][1])





l = [1,2,3,4]

b = l

print(b)



l.append(6)

print(l)

l.insert(2,100)

print(l)



l[2] = 7

print(l)



# 引用傳

a = [1
 
,2,3,4,5]

b = a

b[3] = 999

print(a)



# 值傳

a = [1,2,3,4,5]

b = a[:]

b[3] = 999

print(a)





a = [1,2,3,4,5,6,7]

b = a[4:]

b1 = a[:4]

b2 = a[2:5]

b3 = a[-2]

b4 = a[2:-2]

b5 = a[::2]

f = a[::-1] #倒序

f1 = a[::-2]

print(f1)





g = a.pop()

g1 = a.pop(3)

print(g)

print(a)





# str
 


a = 'xyzlkajgio'

print(a[::-1]) # 字串反轉





a = ['x','y','z']

b = '_'.join(a)

print(b)



c = 'w_g_r_l_u_k'

d = c.split('_')

print(d)





# tuple

a = (1,2,3,4,5)

print(a[3])



b = list(a)

b[3] = 99

c = tuple(b)

print(c)





# dic 是無序的

a = {'c':'asjf','b':2342}

print(a)

print(a['c']
 
)

# print(a['x']) # KeyError: 'x'

print(a.get('c'))

print(a.get('x'))  #None

print(a.get('x','沒有找到'))





# set

a = [1,2,2,4,5,4,3,5,4]

b = set(a)

a = list(b)

print(a)



b = [1,4,3,5,6,3,8]

print(set(a) & set(b))

print(set(a) | set(b))

print(set(a) - set(b))


# set不可以相加


str1 = 'ab'

str2 = 'cd'

str = str1 + str2

print(str)



a = [1,2]

b = [3,5]

c = a+b



c1 = tuple(a)+tuple(b)

print(c)





# file

f = open('work.csv','r') #rb

# a = f.read()

# a1 = f.readline()

a2 = f.readlines()

f.close()

print(a2)



# with open('work.csv','r') as f

#     a = f.read()

# print(a)



f = open('yx.txt','w',encoding='UTF-8')

f.write('yxyx\n')

f.write('yyxx')

f.close()





content = ['yuxiang', '\n', 'hello']

f = open(r'D:test\yx.txt','w',encoding="UTF-8")

f.writelines(content)

f.close()

作業：工作記錄整理程式簡易版

將第10天，第20天，第30天的每個人的平均工資使用程式計算出來

把每天的平均工資都算出來，然後儲存到一個檔案裡面

程式碼：

print("作業三")
f1 = open('work.csv','r')
ls_work = f1.readlines()
len10 = len(ls_work[10].split(',')[1].split('_'))
len20 = len(ls_work[20].split(',')[1].split('_'))
len30 = len(ls_work[30].split(',')[1].split('_'))
f1.close()

with open('salary.csv','r') as f2:
    ls_salary = f2.readlines()
salary10 = int(ls_salary[10].split(',')[1])
salary20 = int(ls_salary[20].split(',')[1])
salary30 = int(ls_salary[30].split(',')[1])

print('第10天每人的平均工資是：{}'.format(salary10/len10))
print('第20天每人的平均工資是：{}'.format(salary20/len20))
print('第30天每人的平均工資是：{}'.format(salary30/len30))