""" p011:学生成绩的排序 """ if __name__ == '__main__': students = [ {"sno": 101,
"sname": "小张", "sgrade": 88}, {"sno": 102, "sname": "小王", "sgrade": 99},
{"sno": 103, "sname": "小李", "sgrade": 77}, {"sno": 104, "sname": "小赵",
"sgrade": 66}, ] students_sort = sorted(students, key=lambda x: x["sgrade"],
reverse=True) print(f"source {students} , sort result:{students_sort}")

""" p012:读取文件实现排序 """ def read_file(): reulst = [] with
open("./p012_student_grade.txt", encoding="utf-8") as fp: for line in fp: line
= line[:-1] line = line.split(",") line[2] = int(line[2]) reulst.append(line)
return reulst def sort_grades(datas): result = sorted(datas, key=lambda x:
x[2]) return result def wirte_file(datas): with
open("./p012_student_grade2.txt", mode="w", encoding="utf-8") as fp: for item
in datas: item[2] = str(item[2]) line = ','.join(item) + "\n" fp.write(line) if
__name__ == '__main__': # 读取文件 datas = read_file() print(datas) # 排序数据 datas =
sort_grades(datas) print(datas) # 写入文件 wirte_file(datas) 101,小张,66 102,小李,44
103,小周,77 104,小赵,88 105,小王,99 106,小余,55 107,小强,22 """ p013:计算学生的最高分,最低分,平均分 """
def compute_score(): scores = [] with open("./p013_students_grade_file.txt",
encoding="utf-8") as fp: for line in fp: line = line[:-1] field =
line.split(',') scores.append(int(field[-1])) max_score = max(scores) min_score
= min(scores) avg_score = round(sum(scores) / len(scores), 2) return max_score,
min_score, avg_score if __name__ == '__main__': max_score, min_score, avg_score
= compute_score() print(f"mx_score = {max_score}, min_score = {min_score},
avg_score = {avg_score}") """ p014:统计英文文章的单词数目 """ if __name__ == '__main__':
word_count = {} with open('./p014_article.txt', encoding="utf-8") as fp: for
line in fp: line = line[:-1] words = line.split() for word in words: if word
not in word_count: word_count[word] = 0 word_count[word] += 1 print(
sorted(word_count.items(), key=lambda x: x[1], reverse=True)[:10] ) """
p015:统计目录下的所有文件大小 """ import os if __name__ == '__main__': sum_size = 0 for
file in os.listdir("."): if os.path.isfile(file): sum_size +=
os.path.getsize(file) print(f"all size of dir:", sum_size/1024) """
p016:使用文件后缀整理文件夹 """ import os import shutil if __name__ == '__main__': dir =
"./p016_arrange_dir" for file in os.listdir(dir): ext =
os.path.splitext(file)[1] ext = ext[1:] if not os.path.isdir(f"{dir}/{ext}"):
os.mkdir(f"{dir}/{ext}") # print(file, ext) source_path = f"{dir}/{file}"
target_path = f"{dir}/{ext}/{file}" shutil.move(source_path, target_path)
 
""" p017:递归搜索目录中最大的文件 """ import os if __name__ == '__main__': search_dir =
"E:\学习" result_files = [] for root, dirs, files in os.walk(search_dir): for
file in files: file_path = os.path.join(root, file)
result_files.append((file_path, os.path.getsize(file_path)/1024))
print(sorted(result_files, key=lambda x: x[1], reverse=True)[:10]) """
p018:计算不同课程的最高分,最低分,平均分 """ if __name__ == '__main__': course_grade = {} with
open("./p018_course_students_grade.txt", encoding="utf-8") as fp: for line in
fp: line = line[:-1] course, sno, sname, grade = line.split(",") #
print(course, sno, sname, grade) if course not in course_grade:
course_grade[course] = [] course_grade[course].append(int(grade)) #
print(course_grade) for course, grades in course_grade.items(): print(course,
max(grades), min(grades), round(sum(grades)/len(grades), 2)) 语文,101,小张,66
语文,102,小李,88 语文,103,小周,67 语文,104,小赵,89 语文,105,小王,75 数学,101,小张,87 数学,102,小李,55
数学,103,小周,99 数学,104,小赵,48 数学,105,小王,58 英语,101,小张,64 英语,102,小李,95 英语,103,小周,66
英语,104,小赵,57 英语,105,小王,68 """ p019:实现不同文件的关联 """ if __name__ == '__main__':
course_teacher_map ={} with open("./p019_teacher_name.txt", encoding="utf-8")
as fp: for line in fp: line = line[:-1] course, teacher = line.split(",")
course_teacher_map[course] = teacher print(course_teacher_map) with
open("./p019_course_students_grade.txt", encoding="utf-8") as fp: for line in
fp: line = line[:-1] course, sno, sname, sgrade = line.split(",") teacher =
course_teacher_map[course] print(course, teacher, sno, sname, sgrade)
语文,101,小张,66 语文,102,小李,88 语文,103,小周,67 语文,104,小赵,89 语文,105,小王,75 数学,101,小张,87
数学,102,小李,55 数学,103,小周,99 数学,104,小赵,48 数学,105,小王,58 英语,101,小张,64 英语,102,小李,95
英语,103,小周,66 英语,104,小赵,57 英语,105,小王,68 语文,周老师 数学,赵老师 英语,李老师 """
p020:批量合并多个text文件 """ import os if __name__ == '__main__': dir =
"./p020_many_texts" contents = [] for file in os.listdir(dir): file_path =
os.path.join(dir, file) if os.path.isfile(file_path) and file.endswith(".txt"):
with open(file_path, encoding="utf-8") as fp: contents.append(fp.read()) #
print(contents) final_content = "\n".join(contents) with
open(dir+"/many_texts.txt", mode="w", encoding="utf-8") as fp:
fp.write(final_content)

 

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